In 2002, NK admitted it had produced nuclear weapons since the 1994 agreement. This upset the US and other UN nations, who sought a solution. North Korea would not give up its nuclear ambitions. Meanwhile, Iraq opened up to UN inspectors, who were making significant inspections. While some elements in the US sought to use force on Iraq, Bush was persuaded by Blair to let inspections occur- and by June, 2003 it was clear that Iraq was disarmed. Meanwhile, North Korea increased their posturing. The Bush administration increased pressure on Beijing to put pressure on North Korea. Unfortunately, Kim Jong-Il expelled the Chinese Ambassador. The PRC sent a message to the United States- if the US invaded Korea, the PRC would assist in the aftermath. The PLA was mobilized and sent to the borders, as the US went to the UN for action. Russia was surprisingly willing to assist and provide troops. The UK and France were willing to send forces, as were Canada, Australia and New Zealand. Japan would provide support. Security Council approval for sanctions was achieved.
The North Koreans launched an artillery barrage, damaging Seoul and other cities in the border area- but soon the aerial bombardment began. Not long after the UN forces swarmed over the border. It took 45 days, and over 2000 US KIA (as well as around 150 UK and France (each), around 100 Canada and Australia (each), around 500 Russian, around 5000 South Korean Military, and 20,000 South Korean Civilian, and about 200 Japanese Civilians. The casualties were far more severe on the North Korean side.