Woman lights candles at a memorial for victims of the downed Malaysia Airlines Flight MH17 in Kuala Lumpur

A woman lights candles at a memorial for victims of the downed Malaysia Airlines Flight MH17 in Kuala Lumpur July 18, 2014. The U.S. said on Friday it could not rule out Russian help to separatists in Ukraine in firing an SA-11 surface-to-air missile that likely downed the Malaysian Boeing 777 in eastern Ukraine with 298 people on board. REUTERS/Athit Perawongmetha (MALAYSIA – Tags: TRANSPORT DISASTER POLITICS CIVIL UNREST)