Once again, don't underestimated Putin. He is not bog down in Ukraine, he's got what he wanted, a neutralised Ukraine. Not any more one country, with NATO try to be out but in as well, troops but without intention to use them in it, Western Countries unable to have a real clear policy.

With Iran and the nuclear deal and now Syria, he is back as major player. No one can ignore him, and he will play n this. Even US are now obliged to change plan.
If you believe he has the same goals than US and EU, you are badly mistaken.

I read so many times in our debates he was finished, and each times it was so wrong.
Russian base in Syria is bigger and stronger.
USA and EU can't do what ever they want (as in Iraq and Libya).
He is able to impose himself on the map.
Not bad for a start.
Will he be bogged down? At this stage, I can't see how, as he plays for the moment as US, UK and France.
If he decides to go on the ground, that might change, but few recent Russian wars showed that their militaries don't hesitate too much on lateral damages, as the school siege by rebels Chechen or in the theatre in Moscow.