you joke, but https://nationalinterest.org/blog/buzz/the-houthis-almost-shot-down-an-f-35-and-washington-is-panicked

Russia’s recent aid seems to be focused on preventing infiltration of special forces. They are also sending attack helicopters and night vision goggles.

This will actually indirectly help Iran’s real air defense by protecting the launchers and radars from saboteurs.

Well at least they’re good for helicopters, but they won’t arrive in time for the planned invasion at this point anyways.