The much-anticipated siege of Raqqa is officially underway, with Syrian and Kurdish militias backed by American military advisers and U.S.-led coalition warplanes leading the charge to liberate ISIS's de facto Syrian capital.
Five major Arab powers severed diplomatic ties with Qatar on June 5, a move that could impact one of U.S. Central Command’s most important overseas airbases — as well as the U.S.-led air campaign against ISIS militants in Iraq and Syria.
