In pictures: Russian warships enter Cuba harbor ReutersUS submarine pulls into Guantanamo Bay a day after Russian warships arrive in Cuba The Associated PressUS attack submarine, one of Russia’s most formidable subs both in Cuba Business InsiderRussian Flotilla Off Florida Coast Sparks Deployment of US Navy Destroyers, Planes Military.comPutin’s fleet of warships in Cuba is direct warning to Biden, experts say Fox News