U.S.-led coalition air strikes killed dozens of Syrian soldiers on Saturday, Russia and a monitoring group said, putting a U.S.-Russian brokered ceasefire in jeopardy and prompting Moscow to seek an emergency U.N. Security Council meeting. The United States military said the coalition stopped the air strike against what it had believed to be Islamic State positions in northeast Syria after Russia informed it that Syrian military personnel and vehicles may have been hit. A U.S. military official said he was "pretty sure" targets mistakenly hit in the coalition strikes were Syrian forces. Russia called for an emergency meeting of the...