Outspoken Philippine President Rodrigo Duterte worries his Japanese hosts. Not just his policy toward the U.S. but also his informal style: Will he chew gum in front of the emperor?
Duterte arrived in Tokyo on Tuesday for a three-day visit, his first since becoming Philippine leader at the end of June.
For diplomats and political leaders, the main issue is his U.S. policy and how Japan can help mend those ties.
Tokyo is a major U.S. ally and has watched with concern as Duterte criticized the U.S. and said he would scale back his country's military engagement with America. He has also worried Japan and the United States by reaching out to China.