Nuclear security

Russia has an underwater nuclear drone capable of carrying a 100-megaton warhead, leaked Pentagon report says

Russia possesses a drone submarine capable of carrying the world's largest nuclear warheads, a leaked Pentagon report claims.

The existence of the underwater nuclear carrier has been rumoured in the past, but the leaked draft of Pentagon's Nuclear Posture Review confirmed this.

The Pentagon report warns of Russia's determination to continue to boost its nuclear weapons reserve while the U.S. had been scaling down.

The drone submarine is able to carry 100-megaton warheads, the largest such weapons available, according to Newsweek.

The draft of the report, first published by the Huffington Post, contains a graphic illustrating new nuclear delivery vehicles developed in the US, Russia, North Korea and China respectively since 2010.