A traffic police officer attempts to stop a car as supporters of Russia's Khabib Nurmagomedov, UFC lightweight champion who defeated Conor McGregor of Ireland in the main event of UFC 229, take part in celebrations in Makhachkala, the capital of the Republic of Dagestan, Russia October 7, 2018. REUTERS/Cis

Supporters of Russia's Khabib Nurmagomedov, UFC lightweight champion who defeated Conor McGregor of Ireland in the main event of UFC 229, take part in celebrations in Makhachkala, the capital of the Republic of Dagestan, Russia October 7, 2018. REUTERS/Kazbek Basayev

Supporters of Russia's Khabib Nurmagomedov, UFC lightweight champion who defeated Conor McGregor of Ireland in the main event of UFC 229, take part in celebrations in Makhachkala, the capital of the Republic of Dagestan, Russia October 7, 2018. REUTERS/Kazbek Basayev

An aerial view of the Dagestan capital of Makhachkala March 24, 2012. To match Special Report RUSSIA-MILITANTS/ REUTERS/Grigory Dukor/File Photo

Dagestani born tycoon Suleiman Kerimov watches a soccer match between Anzhi and CSKA in Makhachkala December 2, 2012. Kerimov built his multi-billion-dollar fortune with an appetite for risk, debt and excellent political connections. Yet there are signs that the secretive mining tycoon has used up his credit with President Vladimir Putin, who exerts a tight grip over the strategic natural resources that fuel Russia's $2 trillion economy. The 47-year-old from Dagestan has found himself in a tight spot after his company Uralkali pulled out of a potash cartel with Belarus in July, upsetting the market and infuriating a close - if difficult - ex-Soviet ally. Picture taken December 2, 2012. REUTERS/Sergei Rasulov/ NewsTeam (RUSSIA - Tags: BUSINESS)

Security guards walk near the museum of late Chechen president Akhmad Kadyrov, with his portrait seen in the background, in Grozny in Chechnya, April 22, 2013. If Tamerlan Tsarnaev was already plotting the Boston Marathon bombings when he stayed in this bustling Russian city at the heart of an Islamist insurgency last year, neighbours say he hid it well. The ethnic Chechen killed in a shootout with U.S. police last week spent at least a month last summer helping his father renovate his first-floor apartment next door to a dentistry in Makhachkala, a city in the Dagestan region on the Caspian Sea. The Caucasian Knot website, which monitors the violence, says 124 people were killed and 75 wounded in the first three months of his year in predominantly Muslim Russian provinces that stretch almost from the Caspian to the Black Sea, and include Dagestan and Chechnya. REUTERS/Maxim Shemetov (RUSSIA - Tags: CRIME LAW CIVIL UNREST SOCIETY POLITICS)

Women pass by the Heart of Chechnya mosque in Grozny in Chechnya, April 22, 2013. If Tamerlan Tsarnaev was already plotting the Boston Marathon bombings when he stayed in this bustling Russian city at the heart of an Islamist insurgency last year, neighbours say he hid it well. The ethnic Chechen killed in a shootout with U.S. police last week spent at least a month last summer helping his father renovate his first-floor apartment next door to a dentistry in Makhachkala, a city in the Dagestan region on the Caspian Sea. The Caucasian Knot website, which monitors the violence, says 124 people were killed and 75 wounded in the first three months of his year in predominantly Muslim Russian provinces that stretch almost from the Caspian to the Black Sea, and include Dagestan and Chechnya. REUTERS/Maxim Shemetov (RUSSIA - Tags: CRIME LAW CIVIL UNREST SOCIETY RELIGION)

A woman stands near the Eternal Flame in Grozny in Chechnya, April 22, 2013. If Tamerlan Tsarnaev was already plotting the Boston Marathon bombings when he stayed in this bustling Russian city at the heart of an Islamist insurgency last year, neighbours say he hid it well. The ethnic Chechen killed in a shootout with U.S. police last week spent at least a month last summer helping his father renovate his first-floor apartment next door to a dentistry in Makhachkala, a city in the Dagestan region on the Caspian Sea. The Caucasian Knot website, which monitors the violence, says 124 people were killed and 75 wounded in the first three months of his year in predominantly Muslim Russian provinces that stretch almost from the Caspian to the Black Sea, and include Dagestan and Chechnya. REUTERS/Maxim Shemetov (RUSSIA - Tags: CRIME LAW CIVIL UNREST SOCIETY)

Headmaster of local school number one Emirmagomed Davydov gives an interview confirming that Boston bombing suspect Dzhokhar Tsarnaev studied at the school in Makhachkala, April 19, 2013. Tsarnaev posted links to Islamic websites and others calling for Chechen independence on what appears to be his page on a Russian social networking site. It says he went to primary school in Makhachkala, capital of Dagestan, a province in Russia that borders Chechnya, and lists his languages as English, Russian and Chechen. REUTERS/Sergei Rasulov (RUSSIA - Tags: CRIME LAW CIVIL UNREST EDUCATION)

A school registry contains information on Boston bombing suspect Dzhokhar Tsarnaev (number 11 in the list) who studied at local school number one in Makhachkala, April 19, 2013. The registry states that Tsarnaev is a Chechen, entered the school in 2001, studied in the first grade and arrived from Kyrgyzstan. Tsarnaev posted links to Islamic websites and others calling for Chechen independence on what appears to be his page on a Russian social networking site. It states he went to primary school in Makhachkala, capital of Dagestan, a province in Russia that borders Chechnya, and lists his languages as English, Russian and Chechen. REUTERS/Sergei Rasulov (RUSSIA - Tags: CRIME LAW CIVIL UNREST EDUCATION)

An exterior view shows local school number one, which Boston bombing suspect Dzhokhar Tsarnaev studied at, in Makhachkala, April 19, 2013. Boston bombing suspect Dzhokhar Tsarnaev posted links to Islamic websites and others calling for Chechen independence on what appears to be his page on a Russian language social networking site. It says he went to primary school in Makhachkala, capital of Dagestan, a province in Russia that borders Chechnya, and lists his languages as English, Russian and Chechen. REUTERS/Sergei Rasulov (RUSSIA - Tags: CRIME LAW CIVIL UNREST EDUCATION)

An exterior view shows local school number one, which Boston bombing suspect Dzhokhar Tsarnaev studied at, in Makhachkala, April 19, 2013. Boston bombing suspect Dzhokhar Tsarnaev posted links to Islamic websites and others calling for Chechen independence on what appears to be his page on a Russian language social networking site. It says he went to primary school in Makhachkala, capital of Dagestan, a province in Russia that borders Chechnya, and lists his languages as English, Russian and Chechen. REUTERS/Sergei Rasulov (RUSSIA - Tags: CRIME LAW CIVIL UNREST EDUCATION)

Two-time Olympic champion in freestyle wrestling Mavlet Batirov (L) takes part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

European champion in the 66kg men's freestyle wrestling Magomedmurat Gajiev jogs during a training session in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 24, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 24, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

A freestyle wrestler takes part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. The placard reads: "Dagestan at the Olympics". Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

European champions in the men's freestyle wrestling Abdusalam Gadisov (R) and Nariman Israpilov play soccer during a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 22, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 22, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING SOCCER)

Two-time Olympic champion in freestyle wrestling Mavlet Batirov (L) takes part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

European champion in the 55kg men's freestyle wrestling Nariman Israpilov wrings sweat out of his shirt during a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

European champion in the 55kg men's freestyle wrestling Nariman Israpilov takes part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Olympic silver medallist in the 120kg men's freestyle wrestling Bakhtiyar Akhmedov (C) attends Friday prayers at a mosque in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING RELIGION)

Olympic silver medallist in the 120kg men's freestyle wrestling Bakhtiyar Akhmedov (C) attends Friday prayers at a mosque in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING RELIGION)

Two-time Olympic champion in freestyle wrestling Mavlet Batirov (R) plays soccer during a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 22, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 22, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING SOCCER)

Olympic silver medallist in the 120kg men's freestyle wrestling Bakhtiyar Akhmedov (R) plays soccer during a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 22, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 22, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Olympic silver medallist in the 120kg men's freestyle wrestling Bakhtiyar Akhmedov takes part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Olympic silver medallist in the 120kg men's freestyle wrestling Bakhtiyar Akhmedov (C) plays soccer during a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 22, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 22, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Olympic silver medallist in the 120kg men's freestyle wrestling Bakhtiyar Akhmedov takes part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Olympic silver medallist in the 120kg men's freestyle wrestling Bakhtiyar Akhmedov (L) takes part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Olympic silver medallist in the 120kg men's freestyle wrestling Bakhtiyar Akhmedov jogs during a training session in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 24, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 24, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Olympic silver medallist in the 120kg men's freestyle wrestling Bakhtiyar Akhmedov takes part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Olympic silver medallist in the 120kg men's freestyle wrestling Bakhtiyar Akhmedov jogs during a training session in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 24, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 24, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Two-time Olympic champion in freestyle wrestling Mavlet Batirov (R) takes part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Olympic silver medallist in the 120kg men's freestyle wrestling Bakhtiyar Akhmedov takes part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Two-time Olympic champion in freestyle wrestling Mavlet Batirov (L) takes part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Two-time Olympic champion in freestyle wrestling Mavlet Batirov (L) takes part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Freestyle wrestlers take part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Freestyle wrestlers take part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Freestyle wrestlers take part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Freestyle wrestlers take part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Olympic silver medallist in the 120kg men's freestyle wrestling Bakhtiyar Akhmedov takes part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Two-time Olympic champion in freestyle wrestling Mavlet Batirov takes part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING)

Freestyle wrestlers take part in a training session at a sport base in Makhachkala, the capital of Russia's North Caucasus republic of Dagestan, March 23, 2012. Russia's leading wrestlers will compete in the country's championship in May for a chance to take part in the Summer Olympics in London. Picture taken March 23, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT OLYMPICS WRESTLING TPX IMAGES OF THE DAY)

An aerial view of the Dagestan capital of Makhachkala March 24, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SOCIETY CITYSPACE)

An aerial view of the Dagestan capital of Makhachkala March 24, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SOCIETY)

An aerial view of the Dagestan capital of Makhachkala March 24, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SOCIETY)

A bride and groom pose as guests look at them near the shores of the Caspian sea as part of their wedding day celebrations in the Dagestan capital of Makhachkala March 24, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SOCIETY)

People visit a beach along the Caspian sea in the Dagestan capital of Makhachkala March 24, 2012. Dagestan, which faces almost daily shootings and bomb attacks, has been caught up in an Islamist insurgency across the mainly Muslim North Caucasus following two separatist wars in Chechnya. REUTERS/Grigory Dukor (RUSSIA - Tags: SOCIETY)

A couple walks at a beach along the Caspian sea near exercise bars in the Dagestan capital of Makhachkala March 24, 2012. Dagestan, which faces almost daily shootings and bomb attacks, has been caught up in an Islamist insurgency across the mainly Muslim North Caucasus following two separatist wars in Chechnya. REUTERS/Grigory Dukor (RUSSIA - Tags: SOCIETY)

Former Argentina World Cup-winning captain Diego Maradona (R) embraces Anzhi captain Roberto Carlos during a visit to the Dagestani capital Makhachkala January 22, 2012. Maradona made a brief visit to the south Russian republic on Sunday as a guest of local football team Anzhi, local media reported. Picture taken January 22. REUTERS/Sergei Rasulov Jr./ NewsTeam (RUSSIA - Tags: SPORT SOCCER)

Cameroonian footballer Samuel Eto'o answers a journalists question during a presentation in the Dagestan capital Makhachkala September 10, 2011. Eto'o signed in August to play for Anzhi Makhachkala, part of a recent spate of high profile signings by the Russian side. Picture taken September 10, 2011. REUTERS/Gennady Fedorov (RUSSIA - Tags: SPORT SOCCER)

Cameroonian footballer Samuel Eto'o poses during a presentation in the Dagestan capital Makhachkala September 10, 2011. Eto'o signed in August to play for Anzhi Makhachkala, part of a recent spate of high profile signings by the Russian side. Picture taken September 10, 2011. REUTERS/Gennady Fedorov (RUSSIA - Tags: SPORT SOCCER)

Cameroon international Samuel Eto'o arrives with his new teammates in the Russian city of Rostov August 26, 2011. Eto'o transferred to Dagestani side Anzhi Makhachkala on Wednesday. REUTERS/Sergei Rasulov Jr/Newsteam (RUSSIA - Tags: SPORT SOCCER)

Cameroon international Samuel Eto'o (R) chats with teammate Benoit Angbwa on the team plane flying to the Russian city of Rostov August 26, 2011. Eto'o transferred to Dagestani side Anzhi Makhachkala on Wednesday. REUTERS/Sergei Rasulov Jr/Newsteam (RUSSIA - Tags: SPORT SOCCER)

Cameroon international Samuel Eto'o (C) signs autographs after arriving with new team mates in the Russian city of Rostov August 26, 2011. Eto'o transferred to Dagestani side Anzhi Makhachkala on Wednesday. REUTERS/Sergei Rasulov Jr/Newsteam (RUSSIA - Tags: SPORT SOCCER)

Cameroon international Samuel Eto'o (C) arrives with his new teammates in the Russian city of Rostov August 26, 2011. Eto'o transferred to Dagestani side Anzhi Makhachkala on Wednesday. REUTERS/Sergei Rasulov Jr/Newsteam (RUSSIA - Tags: SPORT SOCCER)

Roberto Carlos of Anzhi Makhachkala waves to fans before his team's Russian premier league soccer match against Rubin Kazan in Makhachkala April 3, 2011. REUTERS/Kazbek Basayev (RUSSIA - Tags: SPORT SOCCER)

Nadira Isaeva, editor of Dagestani paper Chernovik, speaks during an interview in Russia's southern city of Makhachkala, May 19, 2010. Russia's Dagestan region has overtaken its neighbours as the epicentre of violence in the mainly Muslim North Caucasus, where the Kremlin is struggling to contain an Islamist insurgency. Picture taken May 19, 2010. To match Analysis story RUSSIA-DAGESTAN/VIOLENCE REUTERS/Sergei Rasulov/NewsTeam (RUSSIA - Tags: POLITICS CIVIL UNREST MEDIA RELIGION)

Children play near a local school in the village of Balakhani, 150 km (90 miles) southwest of Dagestan?s capital Makhachkala, April 15, 2010. Islam is flourishing in the North Caucasus, where religion was strongly discouraged under Communism, and Dagestanis are immensely proud of their ancient gateway city of Derbent on the Caspian Sea, where Arabs brought the faith over 1,000 years ago. But with this revival comes also violence and an upsurge in militancy, worrying both government and religious leaders. Picture taken April 15, 2010. To match feature RUSSIA-CAUCASUS/MILITANTS REUTERS/Sergei Rasulov/News Team (RUSSIA - Tags: CRIME LAW)

Rasul Magomedov, father of Maryam Sharipova, walks out of a local school in the village of Balakhani, 150 km (90 miles) southwest of Dagestan?s capital Makhachkala, April 15, 2010. Authorities say Sharipova killed 28 people during the rush hour in the Moscow metro at the end of March. Islam is flourishing in the North Caucasus, where religion was strongly discouraged under Communism, and Dagestanis are immensely proud of their ancient gateway city of Derbent on the Caspian Sea, where Arabs brought the faith over 1,000 years ago. But with this revival comes also violence and an upsurge in militancy, worrying both government and religious leaders. Picture taken April 15, 2010. To match feature RUSSIA-CAUCASUS/MILITANTS REUTERS/Sergei Rasulov/News Team (RUSSIA - Tags: CRIME LAW RELIGION)

Boys sit along a street in the village of Balakhani, 150 km (90 miles) southwest of Dagestan?s capital Makhachkala, May 12, 2010. Islam is flourishing in the North Caucasus, where religion was strongly discouraged under Communism, and Dagestanis are immensely proud of their ancient gateway city of Derbent on the Caspian Sea, where Arabs brought the faith over 1,000 years ago. But with this revival comes also violence and an upsurge in militancy, worrying both government and religious leaders. Picture taken May 12, 2010. To match feature RUSSIA-CAUCASUS/MILITANTS REUTERS/Sergei Rasulov/News Team (RUSSIA - Tags: CRIME LAW RELIGION)

Local residents are seen along a street in the village of Balakhani, 150 km (90 miles) southwest of Dagestan?s capital Makhachkala, May 12, 2010. Islam is flourishing in the North Caucasus, where religion was strongly discouraged under Communism, and Dagestanis are immensely proud of their ancient gateway city of Derbent on the Caspian Sea, where Arabs brought the faith over 1,000 years ago. But with this revival comes also violence and an upsurge in militancy, worrying both government and religious leaders. Picture taken May 12, 2010. To match feature RUSSIA-CAUCASUS/MILITANTS REUTERS/Sergei Rasulov/News Team (RUSSIA - Tags: CRIME LAW RELIGION)