REPUBLIKA.CO.ID, SEOUL - North Korea threatened to attack rival South Korea if Seoul joined a new round of tightened UN sanctions, as Washington unveiled more of its own economic restrictions following Pyongyang's rocket launch last month. In a third straight day of fiery rhetoric, the North directed its verbal onslaught at its neighbor on Friday, saying: "'Sanctions' mean a war and a declaration of war against us."

The reclusive North has this week declared a boycott of all dialogue aimed at ending its nuclear program and vowed to conduct more rocket and nuclear tests after the U.N. Security Council censured it for a December long-range missile launch.

"If the puppet group of traitors takes a direct part in the UN 'sanctions,' the DPRK will take strong physical counter-measures against it," the North's Committee for the Peaceful Reunification of Korea said, referring to the South.

The committee is the North's front for dealings with the South. DPRK is short for the North's official name, the Democratic People's Republic of Korea.

The UN Security Council unanimously condemned North Korea's December rocket launch on Tuesday and expanded existing UN sanctions. On Thursday, the United States slapped economic sanctions on two North Korean bank officials and a Hong Kong trading company that it accused of supporting Pyongyang's proliferation of weapons of mass destruction.

The company, Leader (Hong Kong) International Trading Ltd, was separately blacklisted by the United Nations on Wednesday. Seoul has said it will look at whether there are any further sanctions that it can implement alongside the United States, but said the focus for now is to follow Security Council resolutions.

The resolution said the council "deplores the violations" by North Korea of its previous resolutions, which banned Pyongyang from conducting further ballistic missile and nuclear tests and from importing materials and technology for those programs. It does not impose new sanctions on Pyongyang.

The United States had wanted to punish North Korea for the rocket launch with a Security Council resolution that imposed entirely new sanctions against Pyongyang, but Beijing rejected that option. China agreed to UN sanctions against Pyongyang after North Korea's 2006 and 2009 nuclear tests.

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