Global stocks skid as Hong Kong returns as Sino-U.S. flashpoint

TOKYO (Reuters) - Global shares tumbled on Friday as Hong Kong's political unrest returned as a flashpoint in fast-deteriorating U.S.-China relations, following Beijing's moves to impose a new security law on the city.The Asian financial hub's benchmark Hang Seng index sank 5% to a seven-week low, pulling MSCI's broadest index of Asia-Pacific shares outside Japan down 2.5%.The CSI300 index of mainland Chinese shares dropped 1.9% while Japan's Nikkei lost 1%. Pan-European Euro Stoxx 50 futures..