A nun and member of the Australian Ukrainian community wipes her nose during a prayer vigil for those killed in the crash of Malaysia Airlines flight MH17, at the St Andrew&#039;s Ukrainian Catholic church in Sydney. Australian Prime Minister Tony Abbott blamed Russia on Friday for the shooting down of MH17 over eastern Ukraine, killing all 298 people on board, including 28 Australians. Abbott appeared to go further than other Western leaders in apportioning blame over the crash, demanding that Moscow answer questions about the &quot;Russian-backed rebels&quot; that he said were behind the disaster. (David Gray/Reuters)