LONDON (Reuters) - World stocks remained near record highs on Thursday, after the United States and China signed the first phase of an agreement to end their 18-month trade war.MSCI's broadest index of world stocks was up 0.1%. London , Frankfurt , Paris helped Europe start stronger, after China's biggest stocks dipped overnight. [.SS]The deal signed by U.S. President Donald Trump and Chinese Vice Premier Liu He will roll back only some of tariffs that the two sides have been imposing on each..