Iran's Foreign Ministry says Russia has delivered the first part of its shipment of S-300 air-defense missile systems to Iran.
The announcement was made by Iranian Foreign Ministry spokesman Hossein Jaber Ansari on April 11.
Ansari was replying to reporters' questions about videos on social media showing what appeared to be parts of an S-300 missile system on trucks in northern Iran.
The Kremlin, however, refused to comment on the reports, according to Russian media.
Russia says it canceled a contract to deliver S-300s, among the world's most capable air-defense systems, to Iran in 2010 under pressure from the West.
But President Vladimir Putin lifted that self-imposed ban in April 2015 following an interim nuclear deal between Iran and world powers.
Israel strongly opposes the supply of the system to Iran, which does not recognize the Jewish state.