The ministers' meeting is taking place on the sidelines of the Association of the Southeast Asian Nations (ASEAN) forum.
The six countries involved in the talks - Russia, the United States, China, Japan and the two Koreas - had never yet sent their top diplomats to the negotiations, which have been running since 2003.
The latest round of talks on North Korea was held on July 10-12 in Beijing. The negotiations were given a boost by North Korea's agreement to scrap its nuclear reactors by the end of October, and to allow foreign experts to visit facilities to verify information released by the communist state on its past nuclear activities.
North Korea insists it has met its denuclearization commitments in full, and is demanding that the United States end its "hostile policies".
