Russia And China Are Sprinting To Catch Up With The US's Advanced Submarine Fleet

US national security officials are concerned about the pace and intensity of Russian submarine development, Chief of Naval Operations Adm. Jon Greenert said Thursday.

"There are competitors that are pursuing us. We know about China. That is very well spelled out, but not as many people know what the Russians are up to. I can't go into detail, obviously, but they spend a lot of money.

The Russians have been working on a sea-based strategic deterrence — and an SSN (attack submarine)," Greenert said at the Naval Submarine League's annual symposium in Falls Church, VA.

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