Israel promised Russia it would not launch an attack on Iran, Russian President Dmitry Medvedev said in an interview aired on Sunday in which he described such an assault as “the worst thing that can be imagined.”

Israel has hinted it could forcibly deny Iran the means to make an atomic bomb if it refuses to suspend uranium enrichment and has criticized Russia for agreeing to supply to Tehran S-300 anti-aircraft weapons that could complicate an attack.

In an interview with CNN recorded on Tuesday, Medvedev denied Moscow was backing Iran but said it had the right to supply defensive weapons and said sanctions against Tehran should only be used as a last resort.

An attack would lead to “a humanitarian disaster, a vast number of refugees, Iran’s wish to take revenge and not only upon Israel, to be honest, but upon other countries as well,” Medvedev said, according to a Kremlin transcript.

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