United States says, deployment of its anti-missile defense system,THAAD, in South Korea is not a threat to China. State Department spokesman Mark Toner said at a news briefing that the deployment is a defensive measure against North Korean threats and does not pose a threat to China or any other power in the region. <br/><br/> Repeating the reassurances to China, he said, the issue would be discussed next week when Secretary of State Rex Tillerson makes his first official visits to China, South Korea and Japan. Toner said the US was actively engaged with its regional partners to address North Korea's continuing provocative behaviour and actions.