The United States and China are discussing next steps in response to North Korea's missile tests and could reach a decision on new sanctions this week. <br/><br/>Washington's UN envoy Nikki Haley has said yesterday that China is pushing Pyongyang through back channels to change its behavior and discussing with the United States the timing of a possible new sanctions resolution. <br/><br/>North Korea has carried out three missile tests in less than three weeks, defying UN warnings that it faces new sanctions.<br/>'<br/>The United States launched talks on new sanctions with China a month ago with a view to drafting a proposed resolution to present to the council, but no text has been agreed. <br/><br/>Haley said the council was not backpedalling but rather carefully considering the next moves. Haley has said that the United States will open a dialogue with Pyongyang if it halts its missile and nuclear tests.<br/>