Ukraine is killing Russians with British, German and American missiles, artillery, bullets and just about everything. Russia is mostly killing Ukrainians with self-produced weaponry. It gets very little from Iran. I have seen evidence of Russia using Iranian drones but not missiles. Russian missiles are way better than Iran's.

The death toll on both sides is shockingly high and the UK & US stopped Zelensky accepting a reasonable peace deal that Israel had brokered early in the war.

It seems to me that the US & UK are just as big liars as Russia. Maybe bigger. They also imprison journalists like Tommy Robinson and Julian Assange.

Russia has been promising Iran S-300s for 20 years and hasn't delivered them. There are very few Russian weapons in the Iranian arsenal and those are mostly old tech.

Attempts to link the Russia - Ukraine WWI meat grinder to Israel's rapid, low casualty destruction of Iran's proxies is utterly baseless. BRICS is just a loose economic grouping with nothing in common other than not liking the USA.

Iran is having its proxies destroyed and sooner or later the Mullah regime will be overthrown, either internally or from Israel and or US invading. Russia will not and cannot do anything to stop this.

Iran and Russia are historic enemies with completely different ideological outlooks.
Russia has used Iran for its own purposes from time to time (as cannon fodder in Syria and for drones early in the Ukraine war).

Russia is NOT an ally of Iran.