In the eastern Donetsk region, a group of Ukrainian soldiers fire a heavy 2A36 Giatsint-B field gun at the Russian positions nearby, before their work is interrupted by return fire, forcing them to take cover in their nearby underground shelter. "We did some very good work against the opponent today... we are sitting in the shelter because we came under enemy artillery fire and they work very accurately too," says Roman, a 23-year-old gunner. IMAGES AND SOUNDBITES ARRANGED IN SEQUENCES