Top South Korean, U.S. and Japanese nuclear envoys will hold a trilateral meeting in Washington next week to discuss North Korea's nuclear weapons program, a diplomatic source said.

It's part of regular consultations among the regional powers seeking to resolve the North Korean nuclear issue. Related six-party talks also involving China and Russia have been stalled for seven years.

Hwang Joon-kook, South Korea's special representative for Korean Peninsula peace and security affairs, plans to leave for Washington this weekend to attend the upcoming talks, according to the source.

"The trilateral session will be held around Tuesday," the source said, asking not be named ahead of an announcement of the schedule.

The U.S. will be represented by Sung Kim, the special representative for North Korea policy, and Japan's delegation will be led by Kimihiro Ishikane, who heads the foreign ministry's Asian and Oceanian affairs bureau.

The three countries had the previous gathering of their chief nuclear envoys in Seoul in May.

Next week's meeting will be the first since Japan replaced its top delegate to the six-way talks in October. (Yonhap)