Foreign Minister Fumio Kishida plans to hold informal talks with his Chinese and North Korean counterparts on the sidelines of a ministerial meeting of the ASEAN Regional Forum this weekend in Myanmar's capital of Naypyitaw, government sources said.

It is not known whether Kishida will hold talks with South Korean Foreign Minister Yun Byung-se, though a trilateral meeting involving Kishida, Yun and U.S. Secretary of State John Kerry is likely to take place, with discussion of Pyongyang's nuclear and missile programs top of the agenda.

Tokyo's relations with Beijing and Seoul have soured in recent months amid ongoing territorial disputes as well as differing perceptions of Japan's wartime history.