RCEP has fifteen members, and none has joined since it was signed in 2020
The Regional Comprehensive Economic Partnership is a free trade agreement that fifteen countries signed on 15 November 2020: the ten states that were then members of ASEAN, and five countries that already had their own trade agreements with ASEAN. India took part in the talks from 2012 but withdrew in November 2019. The agreement took effect for ten signatories on 1 January 2022, and the last came under it on 2 June 2023. The parties do not agree on the status of one signatory after its 2021 military takeover. The agreement has been open to new members since July 2023, but none had joined by 4 October 2026. This list counts the fifteen signatories, all of which have ratified.
Name them all first. Then try the harder part: the ten ASEAN members, then the five partners.