Antony Blinken and Chinese Foreign Minister Wang Yi locked horns over Taiwan on the sidelines of a Group of 20 summit in an 'exceptionally candid' meeting on Sunday. The senior officials traded warnings against moves that could further escalate tensions across the Taiwan Strait. In an hour-long meeting in Rome, the U.S. Secretary of State made 'crystal clear' that Washington opposes any unilateral changes by Beijing to the status quo around Taiwan, a senior State Department official said. The face-to-face was described at 'constructive, productive and exceptionally candid' by an official to the Wall Street Journal . Just a week…