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By Christine Kim and Michelle Nichols SEOUL/UNITED NATIONS (Reuters) - The United States on Monday said countries trading with North Korea were aiding its "dangerous nuclear intentions" as the United Nations Security Council mulled tough new sanctions and the isolated regime showed signs of planning more missile tests. South Korea said it was talking to Washington about deploying aircraft carriers and strategic bombers to the Korean peninsula following the North's sixth and most powerful nuclear test on Sunday. At a Security Council meeting, U.S. Ambassador Nikki Haley said North Korea's Kim Jong Un was "begging for war" and urged the 15-member group to adopt the strongest possible measures to deter him.