Iran has supported Russia by providing it with arms to use in Ukraine. Kirby said "support is flowing both ways," with Moscow providing Tehran "an unprecedented level of military and technical support." As part of this burgeoning partnership, Iran expected to receive an unspecified number of Russian Su-35 jets, along with helicopters and even advanced S-400 air-defense systems. REUTERS/FARS NEWS/Ali ShayeganWhile Iran has never armed Russia to the extent it has in recent months, Moscow has sold Tehran considerable military hardware in the past. Paul Iddon is a freelance journalist and columnist who writes about Middle East developments, military affairs, politics, and history.

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