UNITED NATIONS (AP) - The U.N. Security Council responded swiftly to North Korea's latest nuclear test by punishing the reclusive regime Thursday with tough, new sanctions targeting its economy and leadership, despite Pyongyang's threat of a pre-emptive nuclear strike on the United States.
The penalties came in a unanimous resolution drafted by the U.S. along with China, which is North Korea's main benefactor. Beijing said the focus now should be to "defuse the tensions" by restarting negotiations.
The resolution sent a powerful message to North Korea's new young leader, Kim Jong Un, that the international community condemns his defiance of Security Council bans on nuclear and ballistic tests and is prepared to take even tougher action if he continues flouting international obligations.
North Koreans attend a rally at Kim Il Sung Square in Pyongyang on Thursday.
"Taken together, these sanctions will bite, and bite hard," U.S. Ambassador Susan Rice said. "They increase North Korea's isolation and raise the cost to North Korea's leaders of defying the international community."
The new sanctions came in response to North Korea's underground nuclear test on Feb. 12 and were the fourth set imposed by the U.N. since the country's first test in 2006. They are aimed at reining in Pyongyang's nuclear and missile development by requiring all countries to freeze financial transactions or services that could contribute to the programs.
The resolution also targets North Korea's ruling elite by banning all nations from exporting expensive jewelry, yachts, luxury automobiles and race cars to the North. It also imposes new travel sanctions that would require countries to expel agents working for sanctioned North Korean companies.
The success of the sanctions could depend on how well they are enforced by China, where most of the companies and banks that North Korea is believed to work with are based.
Tensions with North Korea have escalated since Pyongyang launched a rocket in December and conducted last month's nuclear test - the first since Kim took charge. Many countries, especially in the region, had hoped he would steer the country toward engagement and resolution of the dispute over its nuclear and missile programs. Instead, the North has escalated its threats.
Immediately before the Security Council vote, a spokesman for Pyongyang's Foreign Ministry said the North will exercise its right for "a pre-emptive nuclear attack to destroy the strongholds of the aggressors" because Washington is "set to light a fuse for a nuclear war."
The statement was carried by the North's official Korean Central News Agency, which issued no comment after the vote.
In the capital of Pyongyang, Army Gen. Kang Pyo Yong told a crowd of tens of thousands that North Korea is ready to fire long-range nuclear-armed missiles at Washington, which "will be engulfed in a sea of fire."
White House spokesman Jay Carney said the U.S. is "fully capable" of defending itself against a North Korea ballistic missile attack.
Experts doubt that the North has mastered how to mount a nuclear warhead on a ballistic missile capable of reaching the mainland United States.
The North Korean statement appeared to be the most specific open threat of a nuclear strike by any country against another. Sen. Robert Menendez, D-N.J., chairman of the Senate Foreign Relations Committee, called the threat "absurd" and suicidal.
North Korea also has threatened to scrap the cease-fire that ended the 1950-53 Korean War. It has a formidable array of artillery near enough to the Demilitarized Zone to strike South Korean and American forces with little warning.
The top U.S. envoy on North Korea, Glyn Davies, cautioned Pyongyang not to miscalculate, saying the U.S. will take necessary steps to defend itself and its allies, including South Korea, where it bases more than 30,000 U.S. forces.
"We take all North Korean threats seriously enough to ensure that we have the correct defense posture to deal with any contingencies that might arise," Davies told reporters.
Rice said "the entire world stands united in our commitment to the denuclearization of the Korean peninsula and in our demand that North Korea comply with its international obligations."
The resolution stresses the Security Council's commitment "to a peaceful, diplomatic and political solution" to North Korea's nuclear program and urges a resumption of the long-stalled six-party talks involving both Koreas, the U.S., China, Russia and Japan.
South Korean U.N. Ambassador Kim Sook said North Korea's threats and statements will be dealt with "resolutely."