Russian submarines are prowling around vital undersea cables. It’s making NATO nervous.

By Michael Birnbaum December 22 at 6:56 PM

BRUSSELS — Russian submarines have dramatically stepped up activity around undersea data cables in the North Atlantic, part of a more aggressive naval posture that has driven NATO to revive a Cold War-era command, according to senior military officials.

The apparent Russian focus on the cables, which provide Internet and other communications connections to North America and Europe, could give the Kremlin the power to sever or tap into vital data lines, the officials said. Russian submarine activity has increased to levels unseen since the Cold War, they said, sparking hunts in recent months for the elusive watercraft.

“We are now seeing Russian underwater activity in the vicinity of undersea cables that I don’t believe we have ever seen,” said U.S. Navy Rear Adm. Andrew Lennon, the commander of NATO’s submarine forces. “Russia is clearly taking an interest in NATO and NATO nations’ undersea infrastructure.”

NATO has responded with plans to reestablish a command post, shuttered after the Cold War, to help secure the North Atlantic. NATO allies are also rushing to boost anti-submarine warfare capabilities and to develop advanced submarine-detecting planes.

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