Here's what Russia's warships in Cuba are capable of

A former Navy rear admiral says the arrival of Russian naval ships in Cuba is a move the U.S. has previously seen from Russia, and the U.S. is prepared for the threat.

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"There have been three of these incidents in the past 20 years, so it's a traditional, normal-sized deployment despite being infrequent," Montgomery said, though he did note the inclusion of the submarine is "somewhat more interesting."

The naval ships included three vessels accompanied by small boats. The flagship frigate, adorned with the Russian and Cuban flags, was greeted by 21-cannon salutes in Cuba's Havana Harbor. Sailors in dress uniform stood in military formation as they approached the island.