Countries involved in the Syrian peace process are set to meet in New York on Dec. 18 but the talks may hinge on efforts to unite Syrian opposition groups in the coming days, U.S. Secretary of State John Kerry said on Tuesday. Russia, the United States, European and Middle Eastern countries...

The U.S.-led coalition fighting ISIS said Tuesday it was "assessing the credibility" of reports its strikes killed at least 26 civilians in a Syrian village Monday. "Every time we get information about the possibility of a civilian casualty incident, we always do a credibility assessment on...

Syria's rebel and opposition groups are trying to forge a common stance over negotiations to end the civil war but the absence of some prominent activists and a main Kurdish force from their meeting in Riyadh shows that unity remains elusive. Saudi Arabia, a strong supporter of rebels fighting...

Russia has asked the United Nations Security Council to hold closed-door discussions on Turkish military action in Syria and Iraq, diplomats said on Monday, in the latest sign of increasing tensions between Moscow and Ankara. Russia's U.N. mission had no immediate comment. But council...