epa06622482 A man reads newspaper next to an electronic board showing the stock index and prices at a securities brokerage in Beijing, China, 23 March 2018. China's market dropped following the new USA policy imposing tariffs on Chinese goods. US President Donald J. Trump on 22 March signed a presidential memorandum targeting what the White House termed 'China's economic aggression'. China is threatening retaliation for the tariffs on $50 billion US dollar (40 billion euro) of Chinese imports, sparking further fears of a trade war.  EPA/ROMAN PILIPEY