Reflecting on U.S. President Donald Trump's first 100 days, his policy toward East Asia and what lies ahead, foreign affairs experts said Saturday that his unpredictability has left many Asian leaders troubled, a trend likely to continue so long as his overall Asia policy remains unclear and focused on bilateral issues.

On the sidelines of the Asian Development Bank's annual meeting in Yokohama, The Japan Times, a media partner for the ADB conference, held a seminar entitled "Trump Diplomacy — The View from Asia" moderated by Eric Johnston, deputy manager of the daily's domestic news division.

Because of Trump's tendency to flip-flop, his policy has been hard to predict and this "may be causing uncertainties among U.S. allies in Asia," such as how Washington will deal with North Korea and China, Hirotsugu Aida, professor at Aoyama Gakuin University, said at the event.