In 2004 7 countries that were once Soviet allies were admitted as new members of this military alliance
[DOC] [TLE] NATO: Pentagon's Gateway Into Former Warsaw Pact, Soviet Nations [PAR] Apr 17, 2010 ... With the accession of Spain into the military alliance of democratic states in 
Europe ... seven new members were inducted, six former Warsaw Pact countries, 
... by 2004 every member of the erstwhile Warsaw Pact outside the Soviet Union 
...