SEOUL, May 26-- Top nuclear envoys of South Korea, the United Statesand Japanwill discuss issues on the Democratic People's Republic of Korea (DPRK)'s nuclear program early next month in Tokyo, Seoul's foreign ministry said on Thursday.

Foreign Ministry spokesman Cho June-hyuk told a press briefing that top representatives of the three countries will share their respective assessment of situations on the Korean Peninsula following the seventh congress of the DPRK's Workers' Party of Korea (DPRK) that ended on May 9.

During the trilateral meeting scheduled for June 1 in Tokyo, the three envoys will discuss cooperation measures on the DPRK's nuclear issue to encourage Pyongyang to change in its attitude toward its nuclear program through sincere implementations of UN Security Council resolutions and each country's independent sanctions.

UN Security Council adopted tougher-than-ever sanctions on the DPRK in March over Pyongyang's fourth nuclear test in January and the launch of a long-range rocket in February. The three nations added standalone sanctions on Pyongyang.

Attending the meeting will be South Korea's special representative for Korean Peninsula peace and security affairs Kim Hong-Kyun, U.S. special representative for DPRK policy Sung Kim and Kimihiro Ishikane, director-general at Japan's foreign ministry. They all represent their respective countries at the six-party talks to dismantle the DPRK's nuclear program.

The latest trilateral talks between the top nuclear envoys were held in Seoul on April 20.