WRAPUP 1-U.S. and China at impasse over trade, Kudlow says new tariffs will remain

WASHINGTON/BEIJING, May 12 (Reuters) - The United States and China appeared at a deadlock over trade negotiations on Sunday as Washington demanded promises ofconcrete changes to Chinese law and Beijing said it would not swallow any "bitter fruit" that harmed its interests.The trade war between the world's top two economies escalated on Friday, with the United States hiking tariffs on $200 billion worth of Chinese goods after President Donald Trump said Beijing 'broke the deal' by reneging on ear