European stocks flat as U.S.-China woes weigh, but post weekly gain

(Reuters) - European shares closed unchanged on Friday although rising U.S.-China tensions hit Asia-exposed banks and luxury stocks, while hopes of a global recovery kept weekly gains intact for the main indexes.Stock markets had a volatile session as Beijing planned to impose a new security law in Hong Kong, raising prospects of fresh protests in the global financial hub and drawing a warning from U.S. President Donald Trump that Washington would react "very strongly".Asia-focused British life..