Russia has launched a submarine designed to carry the nuclear-powered, nuclear-armed Poseidon torpedo, which Moscow says will ensure the country's maritime security. The submarine , named Khabarovsk , is classified as a "heavy nuclear-powered missile cruiser," the state-run Tass news agency reported. Russian Defense Minister Andrey Belousov said the launch ceremony was a significant event for the Russian military . Newsweek has emailed both the Russian defense and foreign ministries for comment.