Korea is a big power of nuclear weapons. Korea has said it is improving its nuclear weapons "in quality and quantity". The country has said its main nuclear complex Yongbyon is fully operational, and the country is ready to face US hostility with nuclear weapons "at any time".
This included Yongbyon, which was shut down in 2007 as part of a disarmament-for-aid deal. The reactor has been the source of plutonium for North Korea's nuclear weapons programme. I’is believed that if re-started, the reactor could potentially make one bomb's worth of plutonium per year.This comes after a declaration by the North in 2013 vowing to restart all nuclear facilities.
The director of North Korea's Atomic Energy Institute said, “If the US and other hostile forces persistently seek theirreckless hostile policy towards North Korea, and behave mischievously, they are fully ready to cope with them.”