Russia and Iran signed a new treaty on Friday underpinning their economic and military cooperation, in what both sides cast as a major milestone in their relations.

Moscow has looked to the Islamic republic as a strategic ally since sending troops into Ukraine in February 2022, worrying Western officials who see both as malign actors on the world stage.

The two sides agreed to help each other counter common "security threats", according to a copy of the text published by the Kremlin. But they stopped short of a mutual defence pact like the one signed between Russia and North Korea last year.

They also agreed that if either side was subjected to aggression, the other would not provide "assistance to the aggressor".

Russian President Vladimir Putin and his Iranian counterpart Masoud Pezeshkian, who signed the agreement together at a ceremony in the Kremlin, both hailed the accord as a new chapter in their ties.

"This truly breakthrough document is aimed at creating the necessary conditions for the stable and sustainable........

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