Russia has offered to sell Iran its Antey-2500 surface-to-air missile system. The head of Russian state-owned defense firm Rostec, Sergei Chemezov, said Iran is considering the offer to purchase the Antey-2500 after an agreement to buy the S-300 surface-to-air missile system was cancelled by Russia in 2010. The Antey-2500 is made by Russian firm Almaz-Antey. The U.S. government sanctioned Chemezov in April 2014 for his role in Russia's war in Ukraine.