Shares stumble as China-U.S. row over Hong Kong clouds trade deal outlook

TOKYO (Reuters) - Global shares slid on Thursday as a fresh row between Washington and Beijing over U.S. bills on Hong Kong could complicate their trade negotiation and delay a "phase one" deal that investors had initially hoped to be inked by now.MSCI's broadest index of Asia-Pacific shares outside Japan fell 1.2%, with Hong Kong's Hang Seng shedding 2% while Japan's Nikkei dropped 1.6%. Chinese mainland shares dropped 0.6% .U.S. S&P500 futures dropped 0.5% in Asian trade, a day after..