This file picture taken by North Korea's official Korean Central News Agency (KCNA) on Dec 12, 2012 shows North Korean rocket Unha-3, carrying the satellite Kwangmyongsong-3, lifting off from the launching pad in Cholsan county, North Pyongan province in North Korea. North Korea said on Jan 24, 2013 it planned to carry out a third nuclear test and more rocket launches aimed at its “arch-enemy” the United States in response to tightened UN sanctions, but offered no timeframe. - AFP Photo
This file picture taken by North Korea's official Korean Central News Agency (KCNA) on Dec 12, 2012 shows North Korean rocket Unha-3, carrying the satellite Kwangmyongsong-3, lifting off from the launching pad in Cholsan county, North Pyongan province in North Korea. North Korea said on Jan 24, 2013 it planned to carry out a third nuclear test and more rocket launches aimed at its “arch-enemy” the United States in response to tightened UN sanctions, but offered no timeframe. - AFP Photo

SEOUL: North Korea on Friday threatened “physical counter-measures” against rival South Korea – the latest in a series of bellicose warnings sparked by a tightening of UN sanctions against Pyongyang.

“If the South Korean puppet regime of traitors directly participates in the so-called UN 'sanctions', strong physical countermeasures would be taken,” the North's Committee for Peaceful Reunification of Fatherland said.

The warning, carried by the official Korean Central News Agency, came a day after North Korea's top military body threatened to conduct a third nuclear test and boost its ability to strike the United States.

The latest warning re-focused Pyongyang's anger from Washington to Seoul.

“Sanctions amount to a declaration of war against us,” said the committee, which is the prime state body responsible for inter-Korean dialogue and exchange.

“As long as the South Korean puppet traitors' regime continues with its anti-DPRK (North Korea) hostile policy, we will never sit down with them,” it said.

The current upsurge in tensions has its roots in Pyongyang's defiant decision to push ahead with a long-range rocket launch on Dec 12 – insisting it was a peaceful mission to place a satellite in orbit.

The rest of the world saw it as a banned ballistic missile test and on Tuesday the UN Security Council unanimously adopted a resolution that expanded sanctions imposed on North Korea after its nuclear tests in 2006 and 2009.

US, supported by China, Japan and South Korea, spearheaded the UN resolution.

Pyongyang reacted furiously, vowing to boost its nuclear arsenal and to conduct a third nuclear test and even longer-range rocket launches in an “all-out action” against its “sworn US enemy”.

The North's reaction poses an early challenge to both US President Barack Obama at the start of his second term, and to South Korean president-elect Park Geun-Hye, who takes office in one month's time.

Park has promised to push for further engagement with North Korea after a virtual five-year freeze in North-South relations during the term of outgoing President Lee Myung-Bak.

But the hawks in her ruling conservative party will leave Park little room for manoeuvre in the current climate, especially if Pyongyang follows through with a third nuclear test.

In Washington on Thursday, White House spokesman Jay Carney criticised the North Korean threat as “needlessly provocative” and stressed that any test would be a “significant violation” of UN Security Council resolutions.

China media threatens North Korea aid cut over atomic test:

North Korea's sole major ally China will decrease aid to Pyongyang if it goes ahead with a planned nuclear test, state-run media said in an unusually frank warning on Friday.

China is the North's leading energy supplier and trade partner and is seen as one of the few nations able to influence Pyongyang's behaviour, with the comments adding a distinctive edge to its typical official calls for stability and dialogue.

“If North Korea engages in further nuclear tests, China will not hesitate to reduce its assistance to North Korea,” the Global Times, which is close to the ruling Communist Party, said in an editorial.

“China hopes for a stable peninsula, but it's not the end of the world if there's trouble there,” it added.

“We should have a pragmatic attitude to deal with the problems and pursue the optimal ratio between our investment of resources and strategic gains.”

The editorial also expressed discontent at North Korean criticism of Beijing for backing a UN Security Council resolution this week that condemned Pyongyang's rocket launch last month and imposed expanded sanctions.

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