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Although it was not the first time North Korea issued such strident rhetoric, its posture, coming under the new leadership of Kim Jong-un, threw a direct challenge to President Barack Obama as he starts his second term, and Park Geun-hye, who will be sworn in as president of South Korea next month. After years of tensions with North Korea, both Mr. Obama and Ms. Park have recently said they were keeping the door open for dialogue with North Korea on the premise that such engagement should lead to the eventual dismantling of its nuclear weapons program.

Simultaneously, Washington reaffirmed its policy of punishing North Korea for moving toward the development of long-range missiles tipped with a nuclear warhead when it spearheaded international backing for a unanimous Security Council resolution on Tuesday.

The resolution condemned North Korea's Dec. 12 rocket launch as a violation of earlier resolutions banning the country from any tests involving ballistic missile technology, and added new sanctions.

In a swift rejection of the U.N. warnings, North Korea said on Wednesday that it will take "physical counteraction" to bolster its "nuclear deterrence both qualitatively and quantitatively." It said, "There can be talks for peace and stability of the Korean Peninsula and the region in the future, but no talks for the denuclearization of the peninsula."

By "physical counteraction," analysts in Seoul said, North Korea most likely meant detonating another nuclear device to demonstrate advances in bomb-making. After analysing the debris of the rocket North Korea fired in December to put a satellite into orbit, South Korean officials said that North Korea indigenously built key components of a missile that can fly more than 6,200 miles.

The analysts said Washington would watch whether a new nuclear test involved a uranium device, as opposed to the previous two tests that used plutonium bombs. North Korea has recently revved up efforts to enrich uranium, ostensibly as fuel for its new nuclear reactor under construction but for practical purposes as a new and more stable source of fuel for nuclear bombs.

North Korea unveiled a brand-new uranium enrichment plant to a visiting American scholar in 2010. But U.S. and South Korean military intelligence officials, using satellite imagery, have since detected more facilities that they suspected could be part of a more expansive enrichment program, military officials here said.

"A nuclear test is the most likely option for the North," said Choi Jin-wook, an analyst at the Korea Institute for National Unification in Seoul.

In recent months, international experts have detected what appeared to be new tunneling activities and efforts to fix flood damages in the Punggye-ri nuclear test site in northeastern North Korea. Kim Min-seok, spokesman for the Defense Ministry of South Korea, told reporters last month that North Korea could conduct a third nuclear in a short notice once its leadership decided to. North Korea conducted an underground nuclear test in Punggye-ri in 2006 and again in 2009.

Each of those tests came as North Korea was protesting a United Nations' decision to impose more sanctions as punishment for rocket tests.

Washington and its allies "know better than any others about the fact that ballistic missile technology is the only means for launching satellite and they launch satellites more than any others," the North Korean statement said on Wednesday. "This is self-deception and the height of double-standards. The essence of the matter is the U.S. brigandish logic that a satellite launch for peaceful purposes by a country which the U.S. antagonizes should not be allowed because any carrier rocket launched by it can be converted into long-range ballistic missile threatening the U.S."

In recent years, North Korea has made it increasingly clear that it is determined to keep its nuclear weapons at whatever costs, undermining a once-popular belief that the Pyongyang regime's brinkmanship was a mere bargaining ploy designed to get as many concessions as possible in exchange for nuclear weapons.

On Wednesday, blaming Washington's "hostile policy," the North said it "drew a final conclusion that denuclearization of the Korean Peninsula is impossible unless the denuclearization of the world is realized." The 2005 deal in which North Korea and the United States agreed in principle upon the dismantling of the North's nuclear weapons program in return for diplomatic incentives "has now become defunct," it said.