I don’t think there was S-300 in Syria after 1980s.
I think Cyprus/Greece, South Korea and China are only nations who got it outside of former Soviet bloc. Germany took over East German units after unification, USAF bought one from Russia in 1990s to evaluate during MIM-104 development but it hasn’t entered service in either Germany or US.
Syria claims Russia has started delivering S300 missiles
30 May 2013
http://www.telegraph.co.uk/news/worldnews/middleeast/syria/10088475/Syria-claims-Russia-has-started-delivering-S300-missiles.html