A serviceman of the self-proclaimed Donetsk People's Republic (DNR) fires a howitzer during a military exercise at a target range outside the town of Horlivka (Gorlivka), Ukraine May 21, 2020. REUTERS/Alexander Ermochenko

Servicemen of the self-proclaimed Donetsk People's Republic (DNR) fire howitzers during military exercises at a target range outside the town of Horlivka (Gorlivka), Ukraine May 21, 2020. REUTERS/Alexander Ermochenko

Russian servicemen drive self-propelled howitzers along the street during a rehearsal for the Victory Day parade, amid the coronavirus disease (COVID-19) outbreak, in Yekaterinburg, Russia April 14, 2020. REUTERS/Alexei Kolchin

U.S. Army soldiers from the 2nd Platoon, B battery 2-8 field artillery, fire a howitzer artillery piece at Seprwan Ghar forward fire base in Panjwai district, Kandahar province southern Afghanistan, June 12, 2011. Picture taken June 12, 2011. REUTERS/Baz Ratner/File Photo SEARCH "POY DECADE" FOR THIS STORY. SEARCH "REUTERS POY" FOR ALL BEST OF 2019 PACKAGES. TPX IMAGES OF THE DAY.

A Turkish army howitzer is positioned near the Turkish-Syrian border in Sanliurfa province, Turkey, October 17, 2019. REUTERS/Murad Sezer

Japanese Ground Self-Defense Force's Type19 155 mm self-propelled howitzer takes part in an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, Japan August 22, 2019. REUTERS/Issei Kato

Japanese Ground Self-Defense Force fires FH70 155mm howitzer during an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, Japan August 22, 2019. REUTERS/Issei Kato

Japanese Ground Self-Defense Force soldiers onboard a Type19 155 mm self-propelled howitzer take part in an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, Japan August 22, 2019. REUTERS/Issei Kato

Japanese Ground Self-Defense Force's Type19 155 mm self-propelled howitzer takes part in an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, Japan August 22, 2019. REUTERS/Issei Kato

MSTA-S self-propelled artillery howitzers drive during a demonstration at the International military-technical forum ARMY-2019 at Patriot Congress and Exhibition Centre in Moscow Region, Russia June 25, 2019. REUTERS/Maxim Shemetov

Soldiers fire a 8 inch (203 mm) M110 self-propelled howitzer during the live fire Han Kuang military exercise, which simulates China's People's Liberation Army (PLA) invading the island, in Pingtung, Taiwan May 30, 2019. REUTERS/Tyrone Siu

Soldiers fire a 8 inch (203 mm) M110 self-propelled howitzer during the live fire Han Kuang military exercise, which simulates China's People's Liberation Army (PLA) invading the island, in Pingtung, Taiwan May 30, 2019. REUTERS/Tyrone Siu

Soldiers reload a 8 inch (203 mm) M110 self-propelled howitzer during the live fire Han Kuang military exercise, which simulates China's People's Liberation Army (PLA) invading the island, in Pingtung, Taiwan May 30, 2019. REUTERS/Tyrone Siu

Russian servicemen drive MSTA-S self-propelled howitzers during the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Dvortsovaya Square in St. Petersburg, Russia May 9, 2019. REUTERS/Anton Vaganov

Russian servicemen drive MSTA-S self-propelled howitzers during the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Red Square in central Moscow, Russia May 9, 2019. REUTERS/Shamil Zhumatov

Russian servicemen drive MSTA-S self-propelled howitzers during the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Red Square in central Moscow, Russia May 9, 2019. REUTERS/Maxim Shemetov

Russian servicemen drive MSTA-S self-propelled howitzers during the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Red Square in central Moscow, Russia May 9, 2019. REUTERS/Shamil Zhumatov

MSTA-S self-propelled howitzers drive during a rehearsal for the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Red Square in central Moscow, Russia May 7, 2019. REUTERS/Maxim Shemetov

MSTA-S self-propelled howitzers drive during a rehearsal for the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Red Square in central Moscow, Russia May 7, 2019. REUTERS/Maxim Shemetov

People make a selfie in front of Russia's army MSTA-S self-propelled howitzers in Tverskaya Street before the rehearsal for the Victory Day parade in Moscow, Russia May 4, 2019. REUTERS/Evgenia Novozhenina

A Russia's army serviceman cleans MSTA-S self-propelled howitzer in Tverskaya Street before the rehearsal for the Victory Day parade in Moscow, Russia May 4, 2019. REUTERS/Evgenia Novozhenina

Pedestrians cross a road nest to a self-propelled howitzer during a rehearsals for the Victory Day military parade in Saint Petersburg, Russia April 30, 2019. REUTERS/Anton Vaganov TPX IMAGES OF THE DAY

Pedestrians cross a road nest to a self-propelled howitzer during a rehearsals for the Victory Day military parade in Saint Petersburg, Russia April 30, 2019. REUTERS/Anton Vaganov

A Russian-made MSTA-S self-propelled howitzer drives along a road, with the Moscow International Business Centre, also known as "Moskva-City", seen in the background, before a rehearsal for the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Moscow, Russia April 29, 2019. REUTERS/Evgenia Novozhenina

M110A2 and M109A2 self-propelled howitzers fire during an anti-invasion drill to test their readiness ahead of Lunar New Year, simulating enemy invasion and the safeguarding of the weapon systems in case of air raid, in Taichung, Taiwan January 17, 2019. REUTERS/Tyrone Siu

A Ukrainian soldier fires with a howitzer during military exercises in the Ukrainian Ground Forces training centre near Honcharivske in Chernihiv region, Ukraine December 3, 2018. REUTERS/Valentyn Ogirenko TPX IMAGES OF THE DAY

A Ukrainian soldier fires with a howitzer during military exercises in the Ukrainian Ground Forces training centre near Honcharivske in Chernihiv region, Ukraine December 3, 2018. REUTERS/Valentyn Ogirenko

Servicemen of the self-proclaimed Lugansk People's Republic (LNR) fire D-30 howitzers during military exercises at a target range in Luhansk Region, Ukraine September 24, 2018. REUTERS/Alexander Ermochenko

Latvian soldiers with their M109 155mm self-propelled howitzer and Polish soldiers with their PT-91 tank take part in the military exercise Namejs 2018 in Adazi, Latvia September 1, 2018. REUTERS/Ints Kalnins

Self-propelled howitzers pass during a military parade marking Ukraine's Independence Day in Kiev, Ukraine August 24, 2018. REUTERS/Gleb Garanich

Russian servicemen sit atop a 2S5 Giatsint-S self-propelled howitzer during the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018. REUTERS/Maxim Shemetov

Russian MSTA-S self-propelled howitzers fire during a demonstration at the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018. REUTERS/Maxim Shemetov

A Russian MSTA-S self-propelled howitzer fires during a demonstration at the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018. REUTERS/Maxim Shemetov

Japanese Ground Self-Defense Force fires a howitzer during an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, Japan August 23, 2018. REUTERS/Kim Kyung-Hoon

Self-propelled howitzers pass during a rehearsal for the Independence Day military parade in central Kiev, Ukraine August 20, 2018. REUTERS/Gleb Garanich

Self-propelled howitzers pass during a rehearsal for the Independence Day military parade in central Kiev, Ukraine August 20, 2018. REUTERS/Gleb Garanich

Military vehicles with howitzers pass during a rehearsal for the Independence Day military parade in central Kiev, Ukraine August 20, 2018. REUTERS/Gleb Garanich

A boy looks at an M115 203 mm howitzer, at a former military fort, ahead of the 60th anniversary of Second Taiwan Straits Crisis against China, in Kinmen, Taiwan August 19, 2018. REUTERS/Tyrone Siu

Howitzer is fired during a 21-gun salute at the National Day parade along Marina Bay in Singapore August 9, 2018. REUTERS/Edgar Su

MSTA-S self-propelled howitzers drive during the Open Water competition for pontoon bridge units, as part of the International Army Games 2018, outside Murom, Russia August 3, 2018. REUTERS/Maxim Shemetov

Members of the Russian team transport MSTA-S self-propelled howitzers on a pontoon bridge during the Open Water competition for pontoon bridge units, as part of the International Army Games 2018, outside Murom, Russia August 3, 2018. REUTERS/Maxim Shemetov

Members of the Russian team transport MSTA-S self-propelled howitzers and T-72 tanks on a pontoon bridge during the Open Water competition for pontoon bridge units, as part of the International Army Games 2018, outside Murom, Russia August 3, 2018. REUTERS/Maxim Shemetov

Russian servicemen drive Koalitsiya-SV self-propelled howitzers during the Victory Day parade, marking the 73rd anniversary of the victory over Nazi Germany in World War Two, at Red Square in Moscow, Russia May 9, 2018. REUTERS/Sergei Karpukhin

A Turkish army howitzer fires from a military post on the Turkish-Syrian border in Hatay province, Turkey February 26, 2018. REUTERS/Umit Bektas

Russian MSTA-S self-propelled howitzers drive during the military parade to commemorate the 75th anniversary of the battle of Stalingrad in World War Two, in the city of Volgograd, Russia February 2, 2018. REUTERS/Tatyana Maleyeva

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

Empty shells are seen next to a Turkish army howitzer on the Turkish-Syrian border in Hatay province, Turkey January 23, 2018. REUTERS/Umit Bektas

Turkish army howitzers fire from a military post on the Turkish-Syrian border in Hatay province, Turkey January 20, 2018. REUTERS/Osman Orsal

Turkish army howitzers fire from a military post on the Turkish-Syrian border in Hatay province, Turkey January 20, 2018. REUTERS/Osman Orsal

Turkish army howitzers fire from a military post on the Turkish-Syrian border in Hatay province, Turkey January 20, 2018. REUTERS/Osman Orsal

Ukrainian servicemen fire a 122mm D-30 howitzer during military exercises near the village of Divychky in Kiev region, Ukraine October 26, 2017. REUTERS/Valentyn Ogirenko

Ukrainian servicemen prepare a 122mm D-30 howitzer for shooting during military exercises near the village of Divychky in Kiev region, Ukraine October 26, 2017. REUTERS/Valentyn Ogirenko

Ukrainian servicemen prepare a shell for a 122mm D-30 howitzer during military exercises near the village of Divychky in Kiev region, Ukraine October 26, 2017. REUTERS/Valentyn Ogirenko

Ukrainian servicemen fire a 122mm D-30 howitzer during military exercises near the village of Divychky in Kiev region, Ukraine October 26, 2017. REUTERS/Valentyn Ogirenko

A Turkish soldier checks a gun on a howitzer during a military exercise near the Turkish-Iraqi border in Silopi, Turkey, September 23, 2017. REUTERS/Umit Bektas

A Turkish howitzer maneuvers during a military exercise near the Turkish-Iraqi border in Silopi, Turkey, September 23, 2017. REUTERS/Umit Bektas

A Turkish howitzer maneuvers during a military exercise near the Turkish-Iraqi border in Silopi, Turkey, September 23, 2017. REUTERS/Umit Bektas

A Turkish howitzer maneuvers during a military exercise near the Turkish-Iraqi border in Silopi, Turkey, September 23, 2017. REUTERS/Umit Bektas

A Turkish howitzer maneuvers during a military exercise near the Turkish-Iraqi border in Silopi, Turkey, September 23, 2017. REUTERS/Umit Bektas