The United States indicated its disappointment at China for backing Russia in a standoff over Ukraine during a meeting between their leaders on Friday, saying that "responsible powers" should call for a de-escalation of tensions.Referring to the talks between Chinese President Xi Jinping and his Russian counterpart Vladimir Putin just before the opening ceremony of the Beijing Winter Olympics, Daniel Kritenbrink, top U.S. diplomat for East Asia, said that it was "important to note" that the meeting came at a time when Moscow "directly threatens Ukraine's sovereignty and territorial integrit…READ FULL ARTICLE