Just to think about it:
Would be fair if the Syrian President Bashar al-Assad bombed France, Saudi Arabia, Qatar, Turkey, US, among others, if it was said there were terrorist cells operating in those countries, against Syria?
I'm not pro-Bashar al-Assad but I do not understand why there's always some countries that believe they can do whatever they want in other's countries. Russia is there in response to al-Assad who asked for help to stop rebels, not only ISIS. Whether right or wrong, Russia answered a request from his partner. However, it looks every country want to go to Syria not only to bomb ISIS, but mainly to hinder Russian President Putin.
Despicable world of self-interest!