Asia stocks retreat; weakness in China outweighs NAFTA trade optimism

TOKYO (Reuters) - Asian stocks handed back earlier gains and fell on Thursday, with Chinese markets fixed firmly on risks from the China-U.S. trade war and taking little comfort from an apparent easing in business tensions in North America and Europe.Spreadbetters expected European stocks to open mixed, with Britain's FTSE and Germany's DAX each slipping about 0.1 percent and France's CAC inching up 0.05 percent. The leaders of the United States and Canada expressed optimism on Wednesday that..