...then the Russians better consider that if there are ICBMs which happen to have been launched from Iran which are overflying Russian airspace during their ascent phase then there is the very real danger that the US will mistakenly think those ICBMs were actually launched by Russia... and take appropriate retaliatory measures.
I think the Russians really need to get with the program vis a vis Iran - they are playing with fire and are likely to get burned a bit more than they think...