The 3+3 is a proposed treaty between Japan, ROK (Republic of Korea), and DPRK (Democratic People’s Republic of Korea) to create a Nuclear Weapons Free Zone (NWFZ), with Negative Security Assurances (NSAs) guaranteed by the US, China, and Russia, not to attack or threaten the area by nuclear weapons. It is based on the definition of the NWFZ set forth by the UN General Assembly in 1975.
The Coalition for the 3+3 (C3+3) intend to assist government(s) of Japan and/or ROK to express formally its intention to work toward a NEA-NWFZ treaty. Historically, it took 13 to 35 years to conclude the treaty after one or more governments of the region have officially proposed the idea. The 3+3 would serve to link up with the existing Asia-Pacific NWFZs; Rarotonga Treaty (1985 South Pacific NFZ), Bangkok Treaty (1995 Southeast Asian NWFZ), Semipalatinsk Treaty (2006 Central Asia NWFZ), and 1998 Mongol Single State NWFZ. It would also be a major inspiration for countries in the Middle East.
Visit their website here: https://coalition3plus3.org/