It was expected that the Iranian military was to have stocked its inventory with the Bavar 373 system as soon as early-2013 but this did not occur because of development issues. Operational-level service is now slated to begin sometime in 2017 - its battlefield effectiveness versus the original Russian design remains to be seen.
Update November 2015: The Russian and Iranian governments have re-entered into a contract to supply S-300 to Iran. The original contract for five S-300 units was suspended in 2010 (due to the ongoing U.N. embargo) to which the Iranian government then filed suit in 2011. The ban was lifted in early 2015 as relations between Iran and the West have thawed. The final S-300 will arrive in 2016.
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