Four Russian ships, including a nuclear-powered submarine, will arrive in Havana, Cuba, next week, according to Cuban officials. Cuban officials cited the "historically friendly relations" between Cuba and Russia as the reason for the visit. None of the ships will carry nuclear weapons according to Cuban officials. Cuban officials say the visit is not considered a threat to the region. It comes amid heightened tensions over Western support for Ukraine against Russia. During the fleet's arrival in Havana, 21 salvos will be fired from one of the ships as a salute reciprocated by Cuban armed forces.