"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," said the spokesperson.
The self-defense measures will comprise of a nuclear test and a ballistic missile test, he added.
The Security Council on Apr 13 issued a statement condemning the Apr 5 Rocket launch of North Korea along with ordering strict enforcement of existing sanctions. This aggravated the communist state.
The country on Apr 14 boycotted the six-party talks, to protest against the Security Council statement.