Barack Obama, Park Geun-hye, Shinzo Abe

President Barack Obama meets with South Korean President Park Geun-hye, left, and Japanese Prime Minister Shinzo Abe during the Nuclear Security Summit in Washington, Thursday, March 31, 2016. (AP Photo/Jacquelyn Martin)

President Barack Obama meets with South Korean President Park Geun-hye, left, and Japanese Prime Minister Shinzo Abe during the Nuclear Security Summit in Washington, Thursday, March 31, 2016. (AP Photo/Jacquelyn Martin)