Telegraph claim: Iran and Russia are negotiating to send the S-400 system to Iran The Telegraph reveals that Iran and Russia are negotiating an agreement to send advanced air defense systems to Tehran. A senior Iranian official said the Islamic Republic is optimistic that Vladimir Putin will finally deliver the S-400 air defense systems Iran has been seeking for years. Secret documents show that security officials formulated recommendations for establishing strategic relations, especially military relations, with independent world powers such as China and Russia; Powers that can neutralize American pressure.