The UN Security Council is poised to hold an emergency session Sunday to deal with North Korea's rocket launch. Japan requested an emergency session Sunday among diplomats on the 15-nation council that handles threats to international peace and security, said Yutaka Arima, a spokesman for Japan's UN mission. That request occurred within minutes of the launch, he said. Approval of a council meeting will come after certain formalities are handled, according to Marco Morales, a spokesman for Claude Heller, Mexico's ambassador to the UN. Mexico holds the council presidency this month. "As soon as we get the letter, we'll call for a meeting to be held as soon as possible," Morales said.