Russia completed its delivery of the S-300 air defense system to Iran, according to Russia's state-owned arms exporter.  In 2010, Russia had cancelled the contract for the S-300s under diplomatic pressure from the United States and Israel, but Russian President Vladimir Putin ended the self-imposed ban on the sale of the system to Iran in 2015.  Delivery of the components of the S-300 to Iran began in April 2016.