The Rybachiy base, which hosts nuclear-powered submarines from Russia’s Pacific Fleet, lies in a cove about 80 miles from the powerful earthquake that struck near the Kamchatka peninsula last week.

A tsunami triggered by an undersea earthquake off the coast of Russia's Kamchatka Peninsula on July 30 appears to have damaged the Rybachiy naval base -- Russia's main base for nuclear submarines in the Pacific.

Russia urged caution after Trump claimed he redeployed nuclear subs in response to provocative remarks by a senior Russian official.