North Korea has vowed to strengthen its nuclear weapons programme, after the UN Security Council voted to expand existing sanctions against Pyongyang.
North Korea said on Wednesday it would hold no more talks on the denuclearisation of the Korean peninsula and would boost its military and nuclear capabilities.
"We will take measures to boost and strengthen our defencive military power including nuclear deterrence," its foreign
ministry said in a statement carried by state news agency KCNA.
Hours earlier, the Security Council voted unanimously to condemn North Korea’s December rocket launch.
The launch is considered by the West as part of a covert programme to develop ballistic missiles that can carry warheads.
The council reiterated its previous demand that North Korea abandon its nuclear weapons programme in a "complete, verifiable and irreversible manner" and cease launches.
The secretive state, already under tough UN sanctions for nuclear tests in 2006 and 2009, said the launch was intended to put a satellite in space.