Teren, a member of the Carpathian Sich battalion, walks through a destroyed building, at the frontline in Kharkiv region, Ukraine, July 1, 2022. At the sharp end of efforts to stop the Russian army's progress in eastern Ukraine are the Carpathian Sich battalion, a unit of Ukrainians and foreign nationals who answered Kyiv's call for help to confront the invader. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY 

A member of the Carpathian Sich battalion sleeps at the group's forward operating base, at the frontline in Kharkiv region, Ukraine, July 1, 2022. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A member of the Carpathian Sich battalion holds white phosphorus ammunition that he said was fired by Russians at the group's forward operating base at the frontline in Kharkiv region, Ukraine, July 1, 2022. At the sharp end of efforts to stop the Russian army's progress in eastern Ukraine are the Carpathian Sich battalion, a unit of Ukrainians and foreign nationals who answered Kyiv's call for help to confront the invader. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Teren, a member of the Carpathian Sich battalion, holds a mortar shell reading "For the boys of Azov", at the frontline in Kharkiv region, Ukraine, July 1, 2022. At the sharp end of efforts to stop the Russian army's progress in eastern Ukraine are the Carpathian Sich battalion, a unit of Ukrainians and foreign nationals who answered Kyiv's call for help to confront the invader. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Teren, a member of the Carpathian Sich battalion, walks through a destroyed building at the frontline in Kharkiv region, Ukraine, July 1, 2022. At the sharp end of efforts to stop the Russian army's progress in eastern Ukraine are the Carpathian Sich battalion, a unit of Ukrainians and foreign nationals who answered Kyiv's call for help to confront the invader. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A man with the nom de guerre Rusyn, the Carpathian Sich battalion acting commander, sits on a couch at the group's base in Kharkiv region, Ukraine, July 1, 2022. The Carpathian Sich is one of several paramilitary nationalist groups that began as volunteers in 2014, when Russia annexed the Black Sea peninsula of Crimea and backed pro-Russian armed separatists in Ukraine's eastern Donbas region. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Members of the Carpathian Sich battalion stand next to a mural reading "Goes to the battle Carpathian Sich" inside the group's forward operating base, at the frontline in Kharkiv region, Ukraine, July 1, 2022. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Carpathian Sich battalion member Denis Polishchuk, 28, who uses the nom de guerre 'Canada', poses at the group's forward operating base at the frontline in Kharkiv region, Ukraine, July 1, 2022. Polishchuk said he hoped to ensure he had a worthy answer if asked by the children he still hopes to father what he had done during the war to help. "I felt that the only dignified response would be that, yes, I was doing my part. I was fighting alongside with everyone else," said Polishchuk, who was born in Ukraine but spent many years in Vancouver. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Hand grenades are placed by an icon of Christ, at the Carpathian Sich battalion's forward operating base, at the frontline in Kharkiv region, Ukraine, July 1, 2022. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Members of the Carpathian Sich battalion talk at the group's forward operating base, at the frontline in Kharkiv region, Ukraine, July 1, 2022. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A medic and member of the Carpathian Sich battalion checks some medicine at the group's forward operating base, at the frontline in Kharkiv region, Ukraine, July 1, 2022. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Members of the Carpathian Sich battalion talk at the group's forward operating base, at the frontline in Kharkiv region, Ukraine, July 1, 2022. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

The impact of a mortar is seen in a field where members of the Carpathian Sich battalion are fighting, at the frontline in Kharkiv region, Ukraine, July 1, 2022. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Artem, a member of the Carpathian Sich battalion, looks out from a destroyed building, at the frontline in Kharkiv region, Ukraine, July 1, 2022. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A member of the Carpathian Sich battalion makes himself tea at the group's forward operating base, at the frontline in Kharkiv region, Ukraine, July 1, 2022. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A member of the Carpathian Sich battalion fires a mortar, at the frontline in Kharkiv region, Ukraine, July 1, 2022. The unit must contend with Russian drones - which the fighters refer to as "black clouds" - that help direct deadly artillery fire onto their positions. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Artem, a member of the Carpathian Sich battalion, checks his weapon at the group's forward operating base in a basement bunker, at the frontline in Kharkiv region, Ukraine, July 1, 2022. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Teren, a member of the Carpathian Sich battalion, stands at the group's forward operating base at the frontline in Kharkiv region, Ukraine, July 1, 2022. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Members of the Carpathian Sich battalion train during an exercise for new recruits at a shooting range, in Kharkiv region, Ukraine, June 30, 2022. The Carpathian Sich is one of several paramilitary nationalist groups that began as volunteers in 2014, when Russia annexed the Black Sea peninsula of Crimea and backed pro-Russian armed separatists in Ukraine's eastern Donbas region. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Members of the Carpathian Sich battalion prepare targets depicting Russian President Vladimir Putin during an exercise for new recruits at a shooting range in Kharkiv region, Ukraine, June 30, 2022. The Carpathian Sich is one of several paramilitary nationalist groups that began as volunteers in 2014, when Russia annexed the Black Sea peninsula of Crimea and backed pro-Russian armed separatists in Ukraine's eastern Donbas region. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY 

Members of the Carpathian Sich battalion sit in a truck as they go to a shooting range, in Kharkiv region, Ukraine, June 30, 2022. The unit must contend with Russian drones - which the fighters refer to as "black clouds" - that help direct deadly artillery fire onto their positions. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A member of the Carpathian Sich battalion takes a break during an exercise for new recruits at a shooting range, as Russia's attack on Ukraine continues, in Kharkiv region, Ukraine, June 30, 2022. REUTERS/Marko Djurica SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A member of the Carpathian Sich battalion fires a rocket-propelled grenade (RPG) during an exercise for new recruits at a shooting range, in Kharkiv region, Ukraine, June 30, 2022. The unit must contend with Russian drones - which the fighters refer to as "black clouds" - that help direct deadly artillery fire onto their positions. REUTERS/Marko Djurica. SEARCH "DJURICA UKRAINE BATTALION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.