"Unless the UN Security Council offers an apology immediately, we will be forced to take additional self-defence measures to protect the highest interests of our republic," a foreign ministry spokesman said in a statement cited by the state-run Korean Central News Agency.
Those measures would include nuclear and ballistic missile tests, it said.
After the Security Council condemned North Korea's rocket launch, which Western powers said was a cover-up for testing a long-range ballistic missile, Pyongyang quit international talks to end its nuclear weapons programme and announced it had restarted re-processing nuclear fuel to obtain plutonium for nuclear arms.
-IANS
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