People mourn victims of the shopping mall fire in Kemerovo near a makeshift memorial at Manezhnaya square in central Moscow, Russia March 27, 2018. REUTERS/Sergei Karpukhin 

A man places flowers at a makeshift memorial for the victims of the shopping mall fire in Kemerovo, at Manezhnaya square in central Moscow, Russia March 27, 2018. REUTERS/Sergei Karpukhin 

A man places flowers to pay tribute to the victims of the shopping mall fire in Russia's Kemerovo, near a board reading "Russia" in the rebel-held city of Donetsk, Ukraine March 27, 2018. REUTERS/Alexander Ermochenko 

A woman places flowers to pay tribute to the victims of the shopping mall fire in Russia's Kemerovo, near a board reading "Russia" in the rebel-held city of Donetsk, Ukraine March 27, 2018. REUTERS/Alexander Ermochenko 

Georgy Sobolev, the technical director of the company which owns the Kemerovo confectionery company, stands inside the defendants' cage as he attends a hearing on his detention in the case of the shopping mall fire at a court in the Siberian city of Kemerovo, Russia March 27, 2018. REUTERS/Polina Ivanova 

Georgy Sobolev, the technical director of the company which owns the Kemerovo confectionery company, sits inside the defendants' cage as he attends a hearing on his detention in the case of the shopping mall fire at a court in the Siberian city of Kemerovo, Russia March 27, 2018. REUTERS/Polina Ivanova 

Men hold a woman on a snowboard as they pose for a picture after finishing a "downhill ski and snowboard descent in swimwear" event on Mount Zelyonaya (The Green Mount), at a ski resort near the town of Sheregesh in the Siberian Kemerovo region April 18, 2015. Organisers said that more than 1,600 snowboarders and skiers from Barnaul, Kemerovo, Krasnoyarsk, Novosibirsk, Novokuznetsk and other Siberian cities turned up for the event, hitting the slopes of Mount Zelyonaya in their swimwear in an attempt to update a Guiness World Record, as part of the annual "Grelka" ski festival. REUTERS/Ilya Naymushin 

A couple rides a cable lift to the start position of a "downhill ski and snowboard descent in swimwear" event on Mount Zelyonaya (The Green Mount), at a ski resort near the town of Sheregesh in the Siberian Kemerovo region April 18, 2015. Organizers said that more than 1,600 snowboarders and skiers from Barnaul, Kemerovo, Krasnoyarsk, Novosibirsk, Novokuznetsk and other Siberian cities turned up for the event, hitting the slopes of Mount Zelyonaya in their swimwear in an attempt to update a Guiness World Record, as part of the annual "Grelka" ski festival. REUTERS/Ilya Naymushin 

Women ride a lift during a "downhill ski and snowboard descent in swimwear" event on Mount Zelyonaya (The Green Mount), at a ski resort near the town of Sheregesh in the Siberian Kemerovo region April 18, 2015. Organisers said that more than 1,600 snowboarders and skiers from Barnaul, Kemerovo, Krasnoyarsk, Novosibirsk, Novokuznetsk and other Siberian cities turned up for the event, hitting the slopes of Mount Zelyonaya in their swimwear in an attempt to update a Guiness World Record, as part of the annual "Grelka" ski festival. REUTERS/Ilya Naymushin 

People dance as they participate in a "downhill ski and snowboard descent in swimwear" event on Mount Zelyonaya (The Green Mount), at a ski resort near the town of Sheregesh in the Siberian Kemerovo region April 18, 2015. Organisers said that more than 1,600 snowboarders and skiers from Barnaul, Kemerovo, Krasnoyarsk, Novosibirsk, Novokuznetsk and other Siberian cities turned up for the event, hitting the slopes of Mount Zelyonaya in their swimwear in an attempt to update a Guiness World Record, as part of the annual "Grelka" ski festival. REUTERS/Ilya Naymushin 

Snowboarders and skiers take part in a "downhill ski and snowboard descent in swimwear" event on Mount Zelyonaya (The Green Mount), at a ski resort near the town of Sheregesh in the Siberian Kemerovo region April 18, 2015. Organisers said that more than 1,600 snowboarders and skiers from Barnaul, Kemerovo, Krasnoyarsk, Novosibirsk, Novokuznetsk and other Siberian cities turned up for the event, hitting the slopes of Mount Zelyonaya in their swimwear in an attempt to update a Guiness World Record, as part of the annual "Grelka" ski festival. REUTERS/Ilya Naymushin 

A couple kisses as they participate in a "downhill ski and snowboard descent in swimwear" event on Mount Zelyonaya (The Green Mount), at a ski resort near the town of Sheregesh in the Siberian Kemerovo region April 18, 2015. Organisers said that more than 1,600 snowboarders and skiers from Barnaul, Kemerovo, Krasnoyarsk, Novosibirsk, Novokuznetsk and other Siberian cities turned up for the event, hitting the slopes of Mount Zelyonaya in their swimwear in an attempt to update a Guiness World Record, as part of the annual "Grelka" ski festival. REUTERS/Ilya Naymushin 

Snowboarders and skiers take part in a "downhill ski and snowboard descent in swimwear" event on Mount Zelyonaya (The Green Mount), at a ski resort near the town of Sheregesh in the Siberian Kemerovo region April 18, 2015. Organisers said that more than 1,600 snowboarders and skiers from Barnaul, Kemerovo, Krasnoyarsk, Novosibirsk, Novokuznetsk and other Siberian cities turned up for the event, hitting the slopes of Mount Zelyonaya in their swimwear in an attempt to update a Guiness World Record, as part of the annual "Grelka" ski festival. REUTERS/Ilya Naymushin 

A woman falls during a "downhill ski and snowboard descent in swimwear" event on Mount Zelyonaya (The Green Mount), at a ski resort near the town of Sheregesh in the Siberian Kemerovo region April 18, 2015. Organisers said that more than 1,600 snowboarders and skiers from Barnaul, Kemerovo, Krasnoyarsk, Novosibirsk, Novokuznetsk and other Siberian cities turned up for the event, hitting the slopes of Mount Zelyonaya in their swimwear in an attempt to update a Guiness World Record, as part of the annual "Grelka" ski festival. REUTERS/Ilya Naymushin 

A woman in a bikini walks up to the start position of a "downhill ski and snowboard descent in swimwear" event on Mount Zelyonaya (The Green Mount), at a ski resort near the town of Sheregesh in the Siberian Kemerovo region April 18, 2015. Organisers said that more than 1,600 snowboarders and skiers from Barnaul, Kemerovo, Krasnoyarsk, Novosibirsk, Novokuznetsk and other Siberian cities turned up for the event, hitting the slopes of Mount Zelyonaya in their swimwear in an attempt to update a Guiness World Record, as part of the annual "Grelka" ski festival. REUTERS/Ilya Naymushin 

Daria Krupenyova, from the town of Prokopyevsk in Kemerovo, finishes working on an ice sculpture called "Cossack's Duty" during the International festival of snow and ice sculptures "The Magical Ice of Siberia" in Krasnoyarsk, Siberia, January 17, 2015. Picture taken January 17, 2015. REUTERS/Ilya Naymushin (RUSSIA - Tags: SOCIETY) 

A Siberian Husky waits for the start of the "Full Wheels Drive 2014" open amateur dog sled and skijoring race near Yelovoye village, outside the Siberian city of Krasnoyarsk, February 9, 2014. About 100 dogs and their owners from various regions of Siberia including Altai, Novosibirsk, Kemerovo and Krasnoyarsk took part in the race. REUTERS/Ilya Naymushin (RUSSIA - Tags: ANIMALS SOCIETY SPORT) 

A contestant skis pulled by two poodles during the "Full Wheels Drive 2014" open amateur dog sled and skijoring race near Yelovoye village, outside the Siberian city of Krasnoyarsk, February 9, 2014. About 100 dogs and their owners from various regions of Siberia including Altai, Novosibirsk, Kemerovo and Krasnoyarsk took part in the race. REUTERS/Ilya Naymushin (RUSSIA - Tags: ANIMALS SOCIETY SPORT) 

A contestant rides on a sledge behind a team of Siberian Husky dogs during the "Full Wheels Drive 2014" open amateur dog sled and skijoring race near Yelovoye village, outside the Siberian city of Krasnoyarsk, February 9, 2014. About 100 dogs and their owners from various regions of Siberia including Altai, Novosibirsk, Kemerovo and Krasnoyarsk took part in the race. REUTERS/Ilya Naymushin (RUSSIA - Tags: ANIMALS SOCIETY SPORT) 

A contestant rides on a sledge with two Siberian Husky dogs during the "Full Wheels Drive 2014" open amateur dog sled and skijoring race near Yelovoye village, outside the Siberian city of Krasnoyarsk, February 9, 2014. About 100 dogs and their owners from various regions of Siberia including Altai, Novosibirsk, Kemerovo and Krasnoyarsk took part in the race. REUTERS/Ilya Naymushin (RUSSIA - Tags: ANIMALS SOCIETY SPORT) 

Aiza Chebodayeva, 20, of Khakassia Republic Khakassia performs during the final show of the 7th "Miss Asia-Siberia" inter-regional amateur beauty and talents contest in Russia's Siberian city of Krasnoyarsk, November 10, 2013. Contenders, mostly students from the Republics of Buryatia, Tuva, Khakassia, Sakha-Yakutia, Bashkortostan, Mountain Shoria in Kemerovo region as well as from Kazakhstan and Kyrgyzstan who study in Siberia and nearby regions, took part in the contest to single out the most beautiful, talented and creative woman who presented the national culture via suits, dances, songs and speech, according to organisers. Picture taken November 10, 2013. REUTERS/Ilya Naymushin (RUSSIA - Tags: ENTERTAINMENT SOCIETY) 

Saizaana Ondar, 22, of Tuva Republic prepares backstage before the final show of the 7th "Miss Asia-Siberia" inter-regional amateur beauty and talents contest in Russia's Siberian city of Krasnoyarsk, November 10, 2013. Contenders, mostly students from the Republics of Buryatia, Tuva, Khakassia, Sakha-Yakutia, Bashkortostan, Mountain Shoria in Kemerovo region as well as from Kazakhstan and Kyrgyzstan who study in Siberia and nearby regions, took part in the contest to single out the most beautiful, talented and creative woman who presented the national culture via suits, dances, songs and speech, according to organisers. Picture taken November 10, 2013. REUTERS/Ilya Naymushin (RUSSIA - Tags: ENTERTAINMENT SOCIETY) 

Lyudmila Popova, 18, of Sakha (Yakutia) Republic performs during the final show of the 7th "Miss Asia-Siberia" inter-regional amateur beauty and talents contest in Russia's Siberian city of Krasnoyarsk, November 10, 2013. Contenders, mostly students from the Republics of Buryatia, Tuva, Khakassia, Sakha-Yakutia, Bashkortostan, Mountain Shoria in Kemerovo region as well as from Kazakhstan and Kyrgyzstan who study in Siberia and nearby regions, took part in the contest to single out the most beautiful, talented and creative woman who presented the national culture via suits, dances, songs and speech, according to organisers. Picture taken November 10, 2013. REUTERS/Ilya Naymushin (RUSSIA - Tags: ENTERTAINMENT SOCIETY) 

Sevda Agayeva (front), 22, of Khakassia Republic performs during the final show of the 7th "Miss Asia-Siberia" inter-regional amateur beauty and talents contest in Russia's Siberian city of Krasnoyarsk, November 10, 2013. Contenders, mostly students from the Republics of Buryatia, Tuva, Khakassia, Sakha-Yakutia, Bashkortostan, Mountain Shoria in Kemerovo region as well as from Kazakhstan and Kyrgyzstan who study in Siberia and nearby regions, took part in the contest to single out the most beautiful, talented and creative woman who presented the national culture via suits, dances, songs and speech, according to organisers. Picture taken November 10, 2013. REUTERS/Ilya Naymushin (RUSSIA - Tags: ENTERTAINMENT SOCIETY) 

Participants perform during the final show of the 7th "Miss Asia-Siberia" inter-regional amateur beauty and talents contest in Russia's Siberian city of Krasnoyarsk, November 10, 2013. Contenders, mostly students from the Republics of Buryatia, Tuva, Khakassia, Sakha-Yakutia, Bashkortostan, Mountain Shoria in Kemerovo region as well as from Kazakhstan and Kyrgyzstan who study in Siberia and nearby regions, took part in the contest to single out the most beautiful, talented and creative woman who presented the national culture via suits, dances, songs and speech, according to organisers. Picture taken November 10, 2013. REUTERS/Ilya Naymushin (RUSSIA - Tags: ENTERTAINMENT SOCIETY) 

Chechek Dazhyi-ool, 19, of Tuva Republic performs during the final show of the 7th "Miss Asia-Siberia" inter-regional amateur beauty and talents contest in Russia's Siberian city of Krasnoyarsk, November 10, 2013. Contenders, mostly students from the Republics of Buryatia, Tuva, Khakassia, Sakha-Yakutia, Bashkortostan, Mountain Shoria in Kemerovo region as well as from Kazakhstan and Kyrgyzstan who study in Siberia and nearby regions, took part in the contest to single out the most beautiful, talented and creative woman who presented the national culture via suits, dances, songs and speech, according to organisers. Picture taken November 10, 2013. REUTERS/Ilya Naymushin (RUSSIA - Tags: ENTERTAINMENT SOCIETY) 

Participants prepare backstage before the final show of the 7th "Miss Asia-Siberia" inter-regional amateur beauty and talents contest in Russia's Siberian city of Krasnoyarsk, November 10, 2013. Contenders, mostly students from the Republics of Buryatia, Tuva, Khakassia, Sakha-Yakutia, Bashkortostan, Mountain Shoria in Kemerovo region as well as from Kazakhstan and Kyrgyzstan who study in Siberia and nearby regions, took part in the contest to single out the most beautiful, talented and creative woman who presented the national culture via suits, dances, songs and speech, according to organisers. Picture taken November 10, 2013. REUTERS/Ilya Naymushin (RUSSIA - Tags: ENTERTAINMENT SOCIETY) 

Lopsan Chaiyndy, 18, of Tuva Republic performs during the final show of the 7th "Miss Asia-Siberia" inter-regional amateur beauty and talents contest in Russia's Siberian city of Krasnoyarsk, November 10, 2013. Contenders, mostly students from the Republics of Buryatia, Tuva, Khakassia, Sakha-Yakutia, Bashkortostan, Mountain Shoria in Kemerovo region as well as from Kazakhstan and Kyrgyzstan who study in Siberia and nearby regions, took part in the contest to single out the most beautiful, talented and creative woman who presented the national culture via suits, dances, songs and speech, according to organisers. Picture taken November 10, 2013. REUTERS/Ilya Naymushin (RUSSIA - Tags: ENTERTAINMENT SOCIETY) 

Ludmila Popova, 18, of Sakha (Yakutia) Republic, receives the winner's crown from former titleholder Shoraana Ondar (L) of Tuva Republic, during the final show of the 7th "Miss Asia-Siberia" inter-regional amateur beauty and talents contest, in Russia's Siberian city of Krasnoyarsk, November 11, 2013. Contenders, mostly students from the Republics of Buryatia, Tuva, Khakassia, Sakha-Yakutia, Bashkortostan, Mountain Shoria in Kemerovo region as well as from Kazakhstan and Kyrgyzstan who study in Siberia and nearby regions, took part in the contest to single out the most beautiful, talented and creative woman who presented the national culture via suits, dances, songs and speech, according to organisers. REUTERS/Ilya Naymushin (RUSSIA - Tags: ENTERTAINMENT SOCIETY) 

Lyudmila Popova, 18, of Sakha (Yakutia) Republic performs during the final show of the 7th "Miss Asia-Siberia" inter-regional amateur beauty and talents contest in Russia's Siberian city of Krasnoyarsk, November 10, 2013. Contenders, mostly students from the Republics of Buryatia, Tuva, Khakassia, Sakha-Yakutia, Bashkortostan, Mountain Shoria in Kemerovo region as well as from Kazakhstan and Kyrgyzstan who study in Siberia and nearby regions, took part in the contest to single out the most beautiful, talented and creative woman who presented the national culture via suits, dances, songs and speech, according to organisers. Picture taken November 10, 2013. REUTERS/Ilya Naymushin (RUSSIA - Tags: ENTERTAINMENT SOCIETY) 

Lyudmila Popova, 18, of Sakha (Yakutia) Republic performs during the final show of the 7th "Miss Asia-Siberia" inter-regional amateur beauty and talents contest in Russia's Siberian city of Krasnoyarsk, November 10, 2013. Contenders, mostly students from the Republics of Buryatia, Tuva, Khakassia, Sakha-Yakutia, Bashkortostan, Mountain Shoria in Kemerovo region as well as from Kazakhstan and Kyrgyzstan who study in Siberia and nearby regions, took part in the contest to single out the most beautiful, talented and creative woman who presented the national culture via suits, dances, songs and speech, according to organisers. Picture taken November 10, 2013. REUTERS/Ilya Naymushin (RUSSIA - Tags: ENTERTAINMENT SOCIETY) 

A brigade of the Russian Railways replaces the rail track of the Trans-Siberian Railway near the Tisul station in the Taiga district, some 200 km (124 miles) east of the Siberian city of Kemerovo, July 2, 2012. Picture taken July 2, 2012. REUTERS/Ilya Naymushin (RUSSIA - Tags: TRANSPORT BUSINESS EMPLOYMENT)

Russian Railways employees replace the rail track of the Trans-Siberian Railway near the Tisul station in the Taiga district, some 200 km (124 miles) east of the Siberian city of Kemerovo, July 2, 2012. Picture taken July 2, 2012. REUTERS/Ilya Naymushin (RUSSIA - Tags: BUSINESS EMPLOYMENT TRANSPORT)

A brigade of the Russian Railways replaces the rail track of the Trans-Siberian Railway near the Tisul station in the Taiga district, some 200 km (124 miles) east of the Siberian city of Kemerovo, July 2, 2012. Picture taken July 2, 2012. REUTERS/Ilya Naymushin (RUSSIA - Tags: TRANSPORT POLITICS BUSINESS)

A brigade of the Russian Railways replaces the rail track of the Trans-Siberian Railway near the Tisul station in the Taiga district, some 200 km (124 miles) east of the Siberian city of Kemerovo, July 2, 2012. Picture taken July 2, 2012. To match Special Report RUSSIA-RAILWAYS/ REUTERS/Ilya Naymushin (RUSSIA - Tags: TRANSPORT POLITICS BUSINESS) 

An employee talks to a driver of a dump truck at the Bachatsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

A dump truck transports coal at the Bachatsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

A woman stands next to a cow near the Krasnobrodsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. Picture taken July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY ANIMALS) 

A measuring tool is seen at the Krasnobrodskaya-Koksovaya coal-preparation plant owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

An employee works at the Krasnobrodskaya-Koksovaya coal-preparation plant owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. Picture taken July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

An employee works at the Krasnobrodskaya-Koksovaya coal-preparation plant owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. Picture taken July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

An employee holds a spanner as she works at the Krasnobrodskaya-Koksovaya coal-preparation plant owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. Picture taken July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

An employee holds a spanner as she works at the Krasnobrodskaya-Koksovaya coal-preparation plant owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. Picture taken July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

An excavator loads a dump truck with coal at the Krasnobrodsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. Picture taken July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

A dump truck transports coal at the Krasnobrodsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

A dump truck transports coal at the Krasnobrodsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. Picture taken July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

An excavator loads a dump truck with coal at the Krasnobrodsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. Picture taken July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

An excavator prepares to load a dump truck with coal at the Krasnobrodsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. Picture taken July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

A dump truck transports coal at the Bachatsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

An excavator loads dump trucks with coal at the Bachatsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

A general view shows the Bachatsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

An employee stands near a dump truck at the Bachatsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

An excavator loads a dump truck with coal at the Bachatsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

An excavator prepares to load dump trucks with coal at the Bachatsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. Picture taken July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

An excavator loads a dump truck with coal at the Bachatsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. Picture taken July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

An excavator loads a dump trucks with coal at the Bachatsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. Picture taken July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

Dump trucks transport coal at the Bachatsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. Picture taken July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

A dump truck transports coal at the Bachatsky opencast colliery owned by Kuzbassrazrezugol company, part of UMMC Ural Mining and Metallurgical Company, some 150 km (93 miles) south of the Siberian city of Kemerovo, July 23, 2012. Picture taken July 23, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENERGY BUSINESS) 

Russian Prime Minister Vladimir Putin instructs a trainee during a judo demonstration at a regional judo centre in the city of Kemerovo, January 24, 2012. REUTERS/Pool (RUSSIA - Tags: SPORT JUDO POLITICS)