Russia fired cruise missiles at Syrian targets this week without giving any advanced notice, U.S. Defense Secretary Ash Carter said on Thursday, describing a trend of unpredictable military action that has put the United States and its allies on edge.

“We’ve seen increasingly unprofessional behavior from Russian forces. They violated Turkish airspace … They shot cruise missiles from the Caspian sea without warning,” Carter said after NATO defense talks in Brussels.

Moscow said on Wednesday its warships fired a barrage of missiles at Syrian targets from the Caspian Sea, passing a distance of almost 1,500 km (900 miles) over Iran and Iraq to reach their targets. [..]