Russia conducted a test of a revolutionary nuclear-capable drone submarine that poses a major strategic threat to U.S. ports and harbors. U.S. intelligence agencies detected the test of the unmanned underwater vehicle, code-named Kanyon by the Pentagon, during its launch from a Sarov-class submarine on Nov. 27, said Pentagon officials familiar with reports of the test. No details were available about the location or results of the test.

Pentagon spokesman Capt. Jeff Davis declined to comment. “We closely monitor Russian underwater military developments, but we will not comment specifically about them,” Davis said. Development of the new drone submarine was first disclosed by the Washington Free Beacon in September 2015 and then confirmed by the Russian military two months later. Russian officials said the secret program was mistakenly disclosed. READ MORE