UN calls an emergency meeting, saying sanctions on Russia expected soon after Russian president signed a decree recognizing separatist regions in east Ukraine; fears that war can cause mass casualties, energy shortages and economic chaos

Military says soldiers fired at 13-year-old as he lobbed a firebomb at passing vehicles, suspect succumbed to injuries en route to hospital despite force rendering him first aid at the scene

Deputy Secretary of State Wendy Sherman says actions 'put the world on the verge of a dark and dangerous era'; Biden signs executive order to halt U.S. business activity in breakaway eastern Ukraine republics

As specter of nuclear deal looms, Israel points to intelligence leads exposing Tehran providing Venezuela with tools meant to raise alarm among American officials