“The big fear is Donald Trump gets in a room with Kim Jong Un and offers to pull all troops from the region in order to get Pyongyang to give up their nukes,” said Joel Wit, a founder of the 38north.org website on North Korea that’s affiliated with Johns Hopkins University.

In particular, Abe has concerns that a possible deal between the U.S. and North Korea could leave Japan vulnerable to attack, Wit said. “But at the end of the day, Trump is going to do what he wants to do.”