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Russia's offensive is dependent on two components: missiles and drones.
Their drones are largely supplied by Iran. Therefore Russia's mission fails outright eventually or is greatly weakened without them.
This could also be used as an excuse for Russia to back out of the war if they need, while strengthening Iran on the basis that if Iran's drones are that significant, competitors are less likely to take on Iran.

Other's have suggested the west persue Turkey as an ally, but this is a dead-end. For starters, Turkey's action of apparently playing all sides, vying for power in the region, is not in fact playing all sides. They have consistently taken positions that benefit eurasia and russia, while flip flopping against europe and the u.s, suggesting their actual goal is strategic distancing, holding us at arms length. Erdogan being who he is, I can only imagine his supporters primarily are trying to stave off westernization and all the cultural rot being forced on them, not to mention any ties to Israel. Nevertheless, one can never serve two masters, so it makes sense Turkey's decisions would work out roughly to be anti-nato/pro russia in general. Any strategy based on flipping turkey is therefore really just introducing a handgrenade that any other nation can try and pull at any time.

Hence Iran. Why Iran?

They are one of the few lynchpins in the middle east that has the most potential to unite the bloc, and thus also represent the biggest threat to western control. By flipping them many things are accomplished at once:
1. the threat of a future bloc is either mitigated or eliminated

2. We have a viable alternative to Israel

3. We have a viable alternative to saudi arabia

4. No more drones, or we compromise the drones going to russia

This could be accomplished by mythologizing Khamenei as "another assad. A lion."

I'm sure hes seen the billions to ukraine.

But aside from that here are the implications that lead to buy-in:
A victory in ukraine, empties out israel into ukraine. Israel is divided and grately weakened.

Having saudi arabia in hand lets us balance and manage the power dynamic that emerges.

Iran instantly gains a real possibility of becoming the lynchpin of the middle east and therefore has a strong reason to change sides.

The key thing is that the u.s. don't bluff: if our allies are threatened, we respond, if our competition are warned not to cross some line, and they do, we respond. If Iran sees hesitance, it won't flip. This is the same reason Russia was so insistent on rewarding its allies, because its not just a matter of supporting russia, its about being able to say "the u.s. will betray you. We won't." which is a significant bargaining chip, one the u.s. should try to remove at all costs. Even a couple instances should be sufficient. It won't change the calculus, but what it does is raises the cost of concessions russia must make to keep allies cooperating, rather than them deciding to become neutral. Do it enough, and it fulfills the earlier, weaker attempt to isolate russia that was mostly based on lies.

I suspect this is part of why the u.s. has been playing a much more friendly balancing act toward Iran lately, but this equivocation Iran has read as the u.s. being two-faced toward our alliance with Israel. The failure to properly commit to open relations with Iran is what has up to this time, caused this strategy to fail. There can be no hesitance.

On the otherhand Russia could counter by simply breaking off the war, denying the u.s. casus belli and consequently forcing a pivot to asia in order to deny the u.s. the administration and congress a distraction from domestic problems. Another option is Russia parlays with syria or saudi arabia and OPEC on behalf of the BRICs (where OPEC sees being locked into the digital USD in its future), greatly diminishing the possibility of the u.s. flipping Iran, simply by increasing the uncertainty of the situation's other critical variables, sort of like Russia has done to both the u.s. and china by cozying up to North Korea, a mistake on the part of China.

In any case, successfully flipping Iran would immediately force one of two outcomes, simply because of how it changes the dynamics of war in ukraine, leading to either 1. world war, as Turkey is forced to commit finally to breaking relations with the west, and thus dividing the middle east as a follow-on, 2. the ceasing of the Russian mission in Ukraine.