Read previewA US Navy nuclear-powered attack submarine arrived in Cuba on Thursday, the Pentagon revealed, putting the American combat vessel in the Caribbean nation at the same time as one of Russia's most formidable subs. AdvertisementThe Los Angeles-class attack submarine USS Helena transits the Atlantic Ocean. One of these vessels is the Kazan, a Yasan-class nuclear-powered cruise missile submarine. A spokesperson for SOUTHCOM said that the Helena's arrival in Cuba was not a direct response to the Russian naval vessels. AdvertisementThe Russian nuclear-powered submarine Kazan arrives at Havana's harbor on June 12.

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