Back in 1962 Iran and Russia made a deal a pact between them. Both agreed to stay out of each other s business. Iran has masterfully infiltrated other nations and shifted their governments to Islam but never Russia. Now, we have a region or territory within Russian borders that is attempting to declare Islamic independence. Russia will not have this, despite the fact they highly support the Islamic states, and most certainly will do so in the future.
Islamic nations are, by and large, pretty wealthy.
Iran has bought billions in weapons from Russia, as has Syria, Iraq, Egypt and others. Russia loves the financial support so they agree to keep good relations with these nations but do NOT want the Islamic influence within their own territories.