Vice Foreign Minister Cho Tae-yeol will attend a meeting of the "coffee club" or Uniting for Consensus, which consists of nations opposed to expanding the permanent members of the UN Security Council.
The meeting takes place in the Mexican resort of Puerto Vallarta on Thursday, the Foreign Ministry said Tuesday.
The aim is to counter efforts by Japan to become a permanent member of the UN Security Council after Japanese Prime Minister Shinzo Abe on a recent trip to Africa sought support for Tokyo's efforts.
The UfC was created by Korea, Mexico, Italy, Spain and Argentina in 1998 and is opposed to Japan, Germany, India or Brazil becoming permanent members of the UN Security Council. They got the nickname "coffee club" for the relaxed atmosphere of the talks.
The UfC meeting in May of 2011 in Rome was attended by 120 UN member countries. A government official said Japan's bid for a permanent seat is "impossible due to the explicit opposition of China, which has veto power."