Russia says Iran has made full payments for its S-300 air defense system Posted on December 4, 2016 by alert5 A Russian presidential aide said Tehran has fully paid for the S-300 air defense system it ordered. Related posts (Automatically Generated): Iran looks at alternatives of S-300 Official from Kremlin confirms delivery of S-300 to Iran has started Russian Defense Minstry buys six An-140-100 Iran to produce long-range air defense missile Iran says it will test indigenous S-300 soon Su-30M2s for Russian Air Force complete flight tests