Israeli soldiers are seen on their military vehicle as a Palestinian woman walks during a protest at the Israel-Gaza border fence, in the southern Gaza Strip December 21, 2018. REUTERS/Ibraheem Abu Mustafa

Piles of rusted out, Soviet-era tanks and military equipment are seen at the "tank graveyard" in Asmara, Eritrea in this photo taken on February 21, 2016. Picture taken February 21, 2016. REUTERS/Thomas Mukoya

Piles of rusted Soviet-era tanks and military equipment are seen at the "tank graveyard" in Asmara, Eritrea in this photo taken on February 21, 2016. Picture taken February 21, 2016. REUTERS/Thomas Mukoya

Soviet armoured vehicles are seen in front of the St. Basil's cathedral during a rehearsal for a military parade to mark the anniversary of a historical parade in 1941 when Soviet soldiers marched towards the front lines, at the Red Square in Moscow, Russia November 5, 2018. REUTERS/Maxum Shemetov

A Palestinian hurls stones at Israeli military vehicles in the village of Shweikeh near Tulkarm, in the occupied West Bank October 20, 2018. REUTERS/Mohamad Torokman

An Israeli tank drives near the border on the Israeli side of the Israel-Gaza border, Israel October 19, 2018 REUTERS/Amir Cohen

A T-72 tank is seen on a shooting range during the military exercise "Preparation and use of troops in the interests of repelling aggression against the Republic of Belarus", near the city of Borisov, Belarus September 11, 2018. REUTERS/Vasily Fedosenko

Fishermen navigate as a machine gun of a Brazilian Navy boat patroling in the Guanabara Bay is pictured, during an operation against drug gangs in Salgueiro slums complex in Sao Goncalo, near Rio de Janeiro, Brazil August 29, 2018. REUTERS/Ricardo Moraes

Brazilian soldiers aboard of an armored boat patrol in the Guanabara Bay during an operation against drug gangs in Salgueiro slums complex in Sao Goncalo, near Rio de Janeiro, Brazil August 29, 2018. REUTERS/Ricardo Moraes

A T-72 tank operated by a crew from Uganda fires during the Tank Biathlon competition at the International Army Games 2018, in Alabino outside Moscow, Russia, July 28, 2018. REUTERS/Sergei Karpukhin

Artilleries belonging to Syrian forces are seen in Quneitra, Syria July 22, 2018. REUTERS/Omar Sanadiki

An Israeli armoured personnel carrier (APC) drives on the Israeli side of the border between Israel and Gaza, May 29, 2018. REUTERS/Amir Cohen TPX IMAGES OF THE DAY

An Israeli armoured personnel carrier (APC) drives on the Israeli side of the border between Israel and Gaza, May 29, 2018. REUTERS/Amir Cohen

Syrian army soldiers ride on a motorbike at a damaged site in al-Hajar al-Aswad, Syria May 21, 2018. REUTERS/Omar Sanadiki

An Israeli tank is seen on the Israeli side of the border fence between Israel and the Gaza Strip May 15, 2018. REUTERS/Baz Ratner

A cow walks past tanks near the border with Syria in the Israeli-occupied Golan Heights, Israel May 11, 2018. REUTERS/Baz Ratner

Cattle stand next to tanks in the Israeli-occupied Golan Heights, Israel May 10, 2018. REUTERS/Ronen Zvulun

A tank, operated by forces loyal to Syria's President Bashar al-Assad, opens fire near the Yarmouk Palestinian camp in Damascus, Syria April 28, 2018. REUTERS/Omar Sanadiki TPX IMAGES OF THE DAY

Israeli soldiers are seen next to the border fence on the Israeli side of the Israel-Gaza border as Palestinians protest on the Gaza side of the border April 6, 2018. REUTERS/Amir Cohen

Israeli soldiers are seen next to the border fence on the Israeli side of the border with the northern Gaza Strip, Israel, March 30, 2018. REUTERS/Amir Cohen

A Turkish armoured vehicle is driven along the Turkish-Syrian border in Hatay province, Turkey February 25, 2018. REUTERS/Umit Bektas

A military weapon is seen on the back of a pick-up truck near Mount Barsaya, northeast of Afrin, Syria January 23, 2018. REUTERS/Khalil Ashawi

A Turkish military tank is seen near Mount Barsaya, northeast of Afrin, Syria January 23, 2018. REUTERS/Khalil Ashawi

Turkish military tanks are seen near Mount Barsaya, northeast of Afrin, Syria January 23, 2018. REUTERS/Khalil Ashawi

A Turkish army howitzer takes position on the Turkish-Syrian border in Hatay province, Turkey January 23, 2018. REUTERS/Osman Orsal

A Turkish army howitzer fires from a military post on the Turkish-Syrian border in Hatay province, Turkey January 23, 2018. REUTERS/Umit Bektas

A member of the Afghan security forces keeps watch near the site of an attack on the Intercontinental Hotel in Kabul, Afghanistan January 20, 2018. REUTERS/Omar Sobhani

An Afghan policeman keeps watch near the site of an attack on the Intercontinental Hotel in Kabul, Afghanistan January 20, 2018. REUTERS/Omar Sobhani

History enthusiast, dressed as a soldier, rides his horse during the re-enactment of Napoleon's famous battle of Austerlitz near the southern Moravian town of Slavkov u Brna, Czech Republic December 2, 2017. REUTERS/David W Cerny TPX IMAGES OF THE DAY

A Turkish soldier points as he stands on a tank during a military exercise near the Turkish-Iraqi border in Silopi, Turkey, September 22, 2017. REUTERS/Umit Bektas TPX IMAGES OF THE DAY

Turkish tanks maneuver during a military exercise near the Turkish-Iraqi border in Silopi, Turkey, September 21, 2017. REUTERS/Umit Bektas TPX IMAGES OF THE DAY

A member of the security forces walks towards a burning vehicles during violence in Panchkula, India, August 25, 2017. REUTERS/Cathal McNaughton TPX IMAGES OF THE DAY

A T-72 tank's barrel is seen while driven through the course of the Tank Biathlon competition, part of the International Army Games 2017, at a range in the settlement of Alabino outside Moscow, Russia, August 8, 2017. REUTERS/Maxim Shemetov TPX IMAGES OF THE DAY

A participant reacts in front of a mock-up tank on fire as university students and relatives of victims march to commemorate the killing of students during a protest in 1975 by Salvadoran military forces, in San Salvador, El Salvador, July 30, 2017. REUTERS/Jose Cabezas TPX IMAGES OF THE DAY

An Australian troop transporter wades onto Langham beach during an amphibious assault landing at the Talisman Saber joint military exercises between Australia and the United States in Queensland, northeast Australia, July 13, 2017. REUTERS/Jason Reed

An Australian troop transporter wades onto Langham beach during an amphibious assault landing at the Talisman Saber joint military exercises between Australia and the United States in Queensland, northeast Australia, July 13, 2017. REUTERS/Jason Reed

A member of the Iraqi Federal Police runs for cover on the frontline in the Old City of Mosul, Iraq June 28, 2017. REUTERS/Ahmed Jadallah TPX IMAGES OF THE DAY

Government soldiers transport a cadaver of a soldier, who was killed during the government troops assault against the insurgents from the Maute group, who seized large parts of the Marawi city, in Iligan, Philippines June 11, 2017. REUTERS/Romeo Ranoco

Government soldiers transport a cadaver of a soldier, who was killed during the government troops assault against the insurgents from the Maute group, who seized large parts of the Marawi city, in Iligan, Philippines June 11, 2017. REUTERS/Romeo Ranoco

A vehicle used for suicide car bombings, made by Islamic State militants, is seen in al-Zanjili neighbourhood in western Mosul, Iraq June 6, 2017. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY

An Iraqi military armoured fighting vehicle (AFV) drives past a burning Iraqi military truck after it was hit by the Islamic State militants during fighting in western Mosul, Iraq June 5, 2017. REUTERS/Erik De Castro TPX IMAGES OF THE DAY

A public transport vehicle carrying residents is driven past a marker towards an evacuation center after government troops continued their assault on fighters from the Maute group who have taken over large parts of Marawi city, southern Philippines May 26, 2017. REUTERS/Romeo Ranoco

Smoke is seen as members of the Iraqi Army clash with Islamic State fighters at a frontline in north west of Mosul, Iraq, May 5, 2017. REUTERS/Danish Siddiqui TPX IMAGES OF THE DAY

FILE PHOTO: An Egyptian military vehicle is seen on the highway in northern Sinai, Egypt, May 25, 2015. To match Special Report EGYPT-POLITICS/SINAI REUTERS/Asmaa Waguih/File Photo

A Belgian soldier patrols in the central station, in Antwerp, Belgium March 3, 2017. REUTERS/Eric Vidal

A Palestinian protester uses a sling to hurl stones towards Israeli troops during clashes in the West Bank village of Tuqu near Bethlehem February 26, 2017. REUTERS/Mussa Qawasma

Members of the Iraqi army launch a rocket towards Islamic State militants during a battle with the IS in western Mosul,Iraq February 25, 2017. REUTERS/Alaa Al-Marjani TPX IMAGES OF THE DAY

Smoke rises next to a position held by the Iraqi rapid response forces during a battle against Islamic State militants in the south of Mosul, Iraq February 19, 2017. REUTERS/Zohra Bensemra TPX IMAGES OF THE DAY

A destroyed Ukrainian tank is pictured on the front line near the government-held industrial town of Avdiyivka, Ukraine February 4, 2017. REUTERS/Gleb Garanich

A tank is seen near the government-held industrial town of Avdiyivka, Ukraine, February 2, 2017. REUTERS/Gleb Garanich

A military vehicles with cannon is seen near the government-held industrial town of Avdiyivka, Ukraine February 1, 2017. REUTERS/Gleb Garanich

Tanks are seen in the government-held industrial town of Avdiyivka, Ukraine February 1, 2017. REUTERS/Gleb Garanich TPX IMAGES OF THE DAY

One of the hijackers of a Libyan Afriqiyah Airways Airbus A320 surrenders to Maltese military on the runway at Malta Airport, December 23, 2016. REUTERS/Darrin Zammit-Lupi MALTA OUT

Two hijackers of a Libyan Afriqiyah Airways Airbus A320 surrender to Maltese military on the runway at Malta Airport, December 23, 2016. REUTERS/Darrin Zammit-Lupi MALTA OUT

Two hijackers of a Libyan Afriqiyah Airways Airbus A320 surrender to Maltese military on the runway at Malta Airport, December 23, 2016. REUTERS/Darrin Zammit-Lupi MALTA OUT

Two hijackers of a Libyan Afriqiyah Airways Airbus A320 surrender to Maltese military on the runway at Malta Airport, December 23, 2016. REUTERS/Darrin Zammit-Lupi MALTA OUT

People disembark from a hijacked Libyan Afriqiyah Airways Airbus A320 on the runway at Malta Airport, December 23, 2016. REUTERS/Darrin Zammit-Lupi MALTA OUT

Maltese troops survey a hijacked Libyan Afriqiyah Airways Airbus A320 on the runway at Malta Airport, December 23, 2016. REUTERS/Darrin Zammit-Lupi MALTA OUT

A Maltese military vehicle stands near a hijacked Libyan Afriqiyah Airways Airbus A320 on the runway at Malta Airport, December 23, 2016. REUTERS/Darrin Zamit-Lupi MALTA OUT

A Maltese military vehicle stands near a hijacked Libyan Afriqiyah Airways Airbus A320 on the runway at Malta Airport, December 23, 2016. REUTERS/Darrin Zamit-Lupi MALTA OUT