Shelling killed 6 people in Donetsk , Ukrainian officials say . Some Ukrainian troops are released by pro - Russian rebels in Donetsk . President Viktor Roman talks about border violations with German leader . As shelling continues , officials in Donetsk describe the situation as ` ` critical ''
Shelling kills 6 civilians in Donetsk , city officials say . 73 Ukrainian troops are released by pro-Russian rebels in Donetsk . President Petro Poroshenko talks about ceasefire violations with German leader . As shelling continues , officials in Donetsk describe the situation as `` critical ''