US National Security Advisor Lieutenant General HR McMaster has said that North Korea represents the greatest immediate threat to the United States and that the potential for war with the communist nation is growing each day. <br/><br/>Pyongyang acquiring nuclear weapons will be the most destabilising development in the post-World War II period, he told Fox News. He said, the US is in a race to address the threat from North Korea. The potential for war is increasing every day but armed conflict is not the only solution.<br/><br/>McMaster said the other grave concern is that North Korea will proliferate or sell off these weapons to others. The NSA said that there is a real grave danger to China, Russia, to all nations, from a North Korea that's armed with nuclear weapons.<br/><br/>McMaster said, there are non-military ways to deal with the issue, such as calling on China to impose greater economic sanctions against Pyongyang. He noted Beijing's tremendous coercive economic power over North Korea.