Pentagon spokesman Geoff Morrell said their presence is not causing alarms to go off.

"So long as they are operating in international waters, as, frankly, we do around the world, and are behaving in a responsible way, they are certainly free to do so, and it doesn't cause any alarm within this building," he said.
...
"There is no need to overreact," the senior defense official said.

In December, a Russian spokesman said that tour demonstrated "Russia's ability to fly its naval flag and ensure protection of its national interests in the world theater."