Dozens of Ukrainian prisoners of war appear to have been killed in a missile strike today, with Moscow and Kyiv accusing each other of carrying out the attack.<br />''<br />''The incident overshadowed U.N.-backed efforts to restart grain shipments from Ukraine and ease a looming global hunger crisis stemming from the war, now in its sixth month.<br />''<br />''Russia's defence ministry said 40 prisoners were killed and 75 wounded in the attack on the prison in the frontline town of Olenivka, in a part of Donetsk province held by separatists.<br />''<br />''Russian news agencies accused Kyiv of targeting it with U.S.-made HIMARS rockets.<br />''<br />''Ukraine's armed forces denied carrying out strikes and blamed it on Russian forces, saying Russian artillery had targeted the prison.<br />''<br />''The Russian defence ministry said the prison housed Ukrainian prisoners of war and eight prison staff were wounded. Russian-backed separatist leader Denis Pushilin was quoted as saying there were no foreigners among 193 people held there.<br />''<br />''<br />