Whether they are communists or capitalists, they are still supplying Iran with nuclear tech, thus they are still supporting the enemy of our friend, Israel, and thus are still butting heads indirectly with us.
If I have mis-analyzed, please correct me.
In 70-th USSR sold uranium fuel to West Germany for they nuclear power stations, and nobody regarded it as proliferation of WMD. For without enrichment such material can not be used in A-bombs. Nuclear research center for personnell training in Iran was built during reighning of Shah Mohammed Reza Pehlevi witout help or consent of USSR.
With Persia/Iran Russia have not waged wars for 200 years. It is too precious tradition to neglect. They did not helped to Chechen separatists and terrorists.
There exists Autonomous Jewish Republic in Russia since 1929. I've red somwhere recently, that last year about 10 000 jews emigrated from Russia, and 50 000 immigrated.