Sweden became NATO’s newest member on Thursday (7 March 2024), upon depositing its instrument of accession to the North Atlantic Treaty with the Government of the United States in Washington DC. With Sweden’s accession, NATO now counts 32 countries among its members.
Apparently, based on that Wikipedia article, they ended up making a new version with less strict veto rules, called the confederated sejm, which is also where I expect all these Western institutions to go eventually. TIL.