What is even more important, Russia is interested in development of North-South corridor Baltic-Saint-Petersbourg/Arkhangelsk-North Dvina-Volga-Caspian sea-Iran-Pakistan(Carachi)/India (Mumbai), and now Iranians are working hard to make their part of this logistic system as smooth as it can be.
Why not?
It could turn much worse for the USA, and personally for Trump, who hasn't had significant support in American society. Russians are quite eager to have a little fight (if necessary undercover). Didn't you heard the new cover of iconic song Fantom ("The Phantom") about brave Russian pilot Li Xi Thung, (aka Lisitsyn, shooting down American planes in the skies of Taiwan, Korea, Vietnam) and now, in the last verse they put direct parallel between jungles of Southern Vietnam and cliffs of the Southern Iran?
One of old, pre-Iran, covers in English:
May be, because he was a traitoror just a fool?