Our Take

More signs of Russian interest in strengthening its sub force. This poses a challenge to the U.S., which has been trying to grow the size of its sub fleet.

Russia conducted a revolutionary nuclear-capable drone submarine test that could pose a major threat to U.S. ports and harbors, according to reports Thursday. U.S. intelligence agencies reportedly detected the test of the unmanned underwater vehicle during its launch from a Sarov-class submarine on Nov.

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