London (Reuters) - Deflating hopes of a swift resolution to the Sino-U.S. trade war knocked world stocks off three-week highs on Tuesday, while growing fears the U.S economy could be headed for recession sooner than expected weighed on the dollar. The German share price index DAX graph is pictured at the stock exchange in Frankfurt, Germany, November 28, 2018. REUTERS/Staff The rapprochement between U.S.