Japanese Finance Minister Taro Aso will travel to the United States on April 25 to meet Treasury Secretary Steven Mnuchin on the sidelines of a summit between Japanese Prime Minister Shinzo Abe and U.S. President Donald Trump, a source said on Thursday.Aso and Mnuchin may discuss provisions against currency manipulation that the United States hopes to include in a trade agreement with Japan, said the source, who has direct knowledge of the matter.Currencies are a sensitive subject for Japan because it has been criticised for keeping the yen weak with monetary easing.Tokyo has long argued that its monetary policy is aimed at generating inflation and not intended to gain an advantage in trade by weakening the yen, but there are lingering concerns this could become a flashpoint in trade talks with the United States......