NATO said it was prepared to send troops to Turkey to defend its ally after violations of Turkish airspace by Russian jets bombing Syria and Britain scolded Moscow for escalating a civil war that has already killed 250,000 people. Officials at the U.S.-led alliance are still...

Senior U.S. lawmakers have begun probing possible intelligence lapses over Moscow’s intervention in Syria, concerned that American spy agencies were slow to grasp the scope and intention of Russia’s dramatic military offensive there, U.S. congressional sources and other officials...

Syrian troops and militia backed by Russian warplanes mounted what appeared to be their first major coordinated assault on Syrian insurgents on Wednesday and Moscow said its warships fired a barrage of missiles at them from the Caspian Sea, a sign of its new military reach. The...

Russia ended high-level military talks with Israel on Wednesday with a call on other countries, including a suspicious United States and aggrieved Turkey, to coordinate operations in Syria. The two countries discussed how they can avoid accidentally clashing while operating in...