Russia and Iran sign an alliance...so it’s worth nothing
Russia and England both invaded Iran in WW2. Together, they installed the Shah and his family.
Trump seems sensitive to Russia’s paranoia.
Iran was seen as no threat (ever) by the Russians.
Installing an overtly pro-western Iranian govt would be viewed as a threat and a “hemming-in” by the Russians.
I think I will rely on Trump and his administration to thread this needle.