Samantha Power, America's new ambassador to the United Nations, skipped a major Security Council meeting Wednesday on the alleged chemical weapons attack in Syria, a move that drew sharp criticism considering her past comments denouncing the council's inaction on the violence. The strike early Wednesday could stand as the deadliest such incident since the country's civil war began, with reports of hundreds dying. The U.N. Security Council called an emergency meeting Wednesday afternoon to debate the allegations, but ended up issuing a statement that fell far short of what the U.S. and its allies wanted. Yet Power herself did not...