James D.J. Brown is a professor of political science at Temple University, Japan Campus.
Message that military aggression is not taboo is worrying for Japan, South Korea and Taiwan

U.S. President Donald Trump shakes hands with Russian President Vladimir Putin at Joint Base Elmendorf-Richardson in Anchorage, Alaska, on Aug. 15. © Reuters
James D.J. Brown is a professor of political science at Temple University, Japan Campus.