A Russian nuclear-powered submarine will make a stop in Havana next week, the Cuban authorities announced late Thursday. The nuclear submarine Kazan and three other Russian naval vessels, including the missile frigate Admiral Gorshkov, an oil tanker and a salvage tug, will dock in the Cuban capital on June 12-17, Cuba’s Ministry of the Revolutionary Armed Forces said in a statement. “None of the vessels are carrying nuclear weapons, so their stop-over in our country does not represent a threat to the region,” the ministry added. The surprise deployment of the Russian military so close to the U…