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A nuclear-powered submarine named Kazan is among the Russian vessels expected to remain through the weekend for a military drill in the Caribbean.
A US intelligence officer told CBS, BBC's North American partner, that the sub is not carrying nuclear weapons - despite its use of nuclear energy.
Cuba's Foreign Ministry identified the other Russian ships as the frigate Admiral Gorshkov, the fleet oil tanker Pashin and the salvage tug Nikolai Chiker.