The North offered to engage in dialogue, and said sanctions would be met by an acceleration of its nuclear program.
North Korea says that it has entered into the "concluding stage" of uranium enrichment, which would give the country a second means of creating material for nuclear weapons. It has previously tested weapons made from plutonium.
KCNA reported that North Korea's delegation at the United Nations had written to the UN Security Council, saying Pyongyang was now ready "for both sanctions and dialogue".
"Reprocessing of spent fuel rods is at its final phase and extracted plutonium is being weaponised," it said.
"If some permanent members of the UN Security Council wish to put sanctions first before dialogue, we would respond with bolstering our nuclear deterrence first before we meet them in a dialogue," the delegation said.
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