North Korean leader Kim Jong-un has ordered his country's nuclear weapons made ready for use at a moment's notice, the official state news agency reported Friday.

Kim also said his country will ready its military so it is prepared to carry out pre-emptive attacks, calling the current situation very precarious, according to KCNA.

On Thursday, North Korea fired six short-range projectiles into the sea off its east coast, South Korean officials said, just hours after the U.N. Security Council approved the toughest sanctions on the North in two decades for its recent nuclear test and long-range rocket launch.