Members of the United Nations Security Council observe a moment of silence for the victims of Malaysia Airlines Flight MH17 at the United Nations headquarters in New York July 18, 2014. World leaders demanded an international investigation into the shooting down of Malaysia Airlines Flight MH17 with 298 people on board over eastern Ukraine in a tragedy that could mark a pivotal moment in the worst crisis between Russia and the West since the Cold War. The U.N. Security Council on Friday called for a “full, thorough and independent international investigation” into the downing of the Malaysian airliner over Ukraine, urging all parties to grant investigators access to the site. REUTERS/Lucas Jackson (UNITED STATES – Tags: DISASTER TRANSPORT POLITICS)