By Anton Zverev HRABOVE Ukraine Fri Jul 18, 2014 2:10am EDT (Reuters) – World leaders demanded an international investigation into the shooting down of a Malaysian airliner over eastern Ukraine in which all 298 people on board were killed, a tragedy that could further heighten tensions between Russia and the West. One U.S. official said Washington strongly suspected a surface-to-air missile that downed the Malaysia Airlines Boeing 777 on a flight from Amsterdam to Kuala […]