North Korea unveiled for the first time a nuclear-powered submarine under construction, a weapons system that can pose a major security threat to South Korea and the US. State media on Saturday ...

The fleet attack submarines are powered by a Rolls-Royce PWR2 (Core H) reactor and fitted with a pump-jet propulsor, the same reactor that was developed for the Royal Navy's Vanguard-class ...

By Choe Sang-Hun Reporting from Seoul North Korea said on Saturday that it was building its first nuclear-powered submarine to enhance its nuclear weapons abilities, and the state news media ...