What's interesting is that Russia is an allie of Iran, Syria, and North Korea which are all states that support terrorists and are hostile to the us. If Russia is successful against isis (based on their effort in Afghanistan I think they will not be) what do they expect in return?
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Russia is not merely concerned with ISIS, their goal is a return of all Syrian territory to the legitimate Syrian government. Russia is in Syria to stay, and actually has had a military base in Latakia, Syria for decades. They will eliminate ISIS along with al-Qaeda (aka JaN/JFS) along with ISIS-affiliated Jund al-Aqsa and the rest of the rebels, including the FSA. The only non-Syrian govt forces that will not be exterminated will be the YPG (kurdish forces), because they have already allied with the Syrian govt. I think you have a cursory understanding of this conflict, and are extending yourself in your assessment of what will happen.
On top of that, Russia is not an "allie" of North Korea, they actually have almost no diplomatic or trade relations whatsoever. You also seem to lack an even cursory understanding of Russian foreign policy, along with a poor understanding of the Afghan conflict. I can understand, given that a medical doctor has more important fields of study than global politics. In fact, it's likely that a good understanding of global politics might very well serve to be a detriment to a medical doctor. So, perhaps I can illuminate some of the relations and whom the real "sponsors of terror" are in the world.
Arguably the US is the biggest world sponsor of "terror" if you consider its history, but lets pretend that's an absurdity that could never be true and focus on your post; Russia does not sponsor global terrorist insurgencies attempting to overthrow legitimate elected rulers. It may have in decades past, during the USSR, and it has taken control of adjacent territories using military means (chechnya, georgia,ukraine) but those are all arguably Russian, given their history as part of the Russian empire. Russia would not have concern, and has never expressed concern, for the perpetual US involvement in Mexican drug wars and central american dictatorships. They allow us to do this, because it's our back yard. The same allowance should be granted to Russia, but somehow not only are they not allowed to act in the Middle East, but also right on their doorstep. It's absurd.
The accusations of terrorist support in Iran are certainly more palatable than the absurd North Korean and Russian accusations, but they are still mostly derived from an inherent racist anti-persian and pro-israeli US media. It is drilled into the US public mind that Iran is evil, and Saudis are nice old men with $ for american contractors. Israelis are of course the best human beings on the planet, smart and white and just swell. But Iranians? EVIL! Never mind us shooting down their airliner, or installing a puppet dictator who tortured tens of thousands. Or sponsoring both sides of a war that killed millions of them. Or attempting to destroy their economy. Or aiding their allies who threaten to nuke them. Or threatening to nuke them ourselves, for nothing. Never mind that the 911 suicide bombers were Saudi, Egyptian, and Lebanese... but not a single one was Iranian. Just never mind! Minds are for chumps.