( CNN ) -- North Korea threatened to conduct a nuclear test and more ballistic missile tests if the U.N. Security Council does n't withdraw its condemnation of Pyongyang 's rocket launch earlier this month , the state-run Korean Central News Agency reported . A photo released by North Korea 's official Korean Central News Agency showing the recent rocket launch . The U.N. Security Council `` should promptly make an apology for having infringed the sovereignty of [ North Korea ] and withdraw all its unreasonable and discriminative 'resolutions ' and decisions adopted against [ North Korea ] , '' a spokesman for the North 's Foreign Ministry said in a statement . `` The measures will include nuclear tests and test-firings of intercontinental ballistic missiles , '' the unidentified spokesman said . The statement also said Pyongyang will start building a light-water nuclear power plant and begin production of nuclear fuel . The Security Council condemned the April 5 rocket launch as a violation of a 2006 resolution that bans North Korea 's ballistic missile activity . North Korea , angered by the Security Council 's unanimous vote , has threatened to walk away from the six-party talks aimed at disarming the country of nuclear weapons . It has said it will restore its disabled nuclear reactor . The six-party talks -- involving China , Japan , North Korea , Russia , South Korea and the United States -- have been aimed at persuading North Korea to scrap its nuclear program . North Korea has begun reprocessing fuel rods , its Foreign Ministry said Saturday , according to state-run media . `` The reprocessing of spent fuel rods from the pilot atomic power plant began as declared in the Foreign Ministry statement dated April 14 , '' a ministry spokesman said . `` This will contribute to bolstering the nuclear deterrence for self-defense in every way to cope with the increasing military threats from the hostile forces . ''
N. is angered by U.N. condemnation of recent rocket launch . North Korea begins manufacturing nuclear fuel rods , state media reports . Process to upgrade country 's nuclear capability , foreign ministry says . Has also threatened to walk away from the six - party nuclear talks .