 Greece became a firm supporter of Bulgaria’s EU membership and was the fifth EU member state and the first old member state to ratify the Accession Treaty.Since Bulgaria joined NATO in May 2004, Greek-Bulgarian relations have been developing on all fronts, and the Greek Ministry of Foreign Affairs describes relations between Greece and Bulgaria as "excellent".In 2018, declassified documents of the Communist Bulgaria revealed a plan to foment crisis between Turkey and Greece in 1971.