The top diplomats of South Korea, the United States and Japan will hold a meeting early next week in New York to discuss countermeasures against North Korea's recent nuclear test, the foreign ministry in Seoul said Wednesday.

The trilateral meeting will be held among South Korean Foreign Minister Yun Byung-se, U.S. Secretary of State John Kerry and Japanese Foreign Minister Fumio Kishida. They will meet Sunday (local time) on the sidelines of the United Nations General Assembly session.

"During the upcoming meeting to be held amid unprecedentedly grave security situations, they are expected to mostly discuss comprehensive and strong measures against the North," the ministry said in a press release.

They will also include additional sanctions both by the U.N.

Security Council and main allies, the ministry added.

The foreign minsters' meeting comes after the North conducted its fifth nuclear test Friday in defiance of stepped-up warnings by the international community to halt its military provocations. 

On Tuesday, the top U.S. nuclear negotiator, Sung Kim, promised to seek the strongest possible sanctions against the North in a press conference in Seoul after holding talks with his South Korean counterpart. (Yonhap)