SpaceWar.com reports: “A US nuclear-powered submarine has arrived in Cuba, the Pentagon said Thursday, a day after a Russian nuclear sub docked in Havana for a rare visit to the communist island.

‘The fast-attack submarine USS Helena is in Guantanamo Bay, Cuba as part of a routine port visit,’ the US Southern Command said in a social media post, referring to the American naval base on the island.

‘The vessel’s location and transit were previously planned,’ it added…”