Before revision: Previous members Fifteen former member states of the PfP (namely Albania, Bulgaria, Croatia, Czech Republic, Estonia, Finland, Hungary, Latvia, Lithuania, Montenegro, North Macedonia, Poland, Romania, Slovakia, Slovenia and Sweden) have subsequently joined NATO.
After revision: Previous members 16 former member states of the PfP (namely Albania, Bulgaria, Croatia, Czech Republic, Estonia, Finland, Hungary, Latvia, Lithuania, Montenegro, North Macedonia, Poland, Romania, Slovakia, Slovenia and Sweden) have subsequently joined NATO.