What, exactly, are the Russian military doing on Syrian territory? This is so far from their own borders.
A better question is why does Ukraine help the terrorist groups in another sovereign nation far away from its own borders?
It is worth recalling the words of the head of the Main Intelligence Directorate of Ukraine Budanov that Russian war criminals will receive fair punishment in different parts of the world, wherever they are. And now we are seeing it live.
Ukraine cooperating with Terrorists organizations like Al-Qauida and ISIS in another sovereign nation called Syria that is destabilizing that country and the entire region has nothing to do with "punishing Russia". It is an act of terrorism and an attack on Syria, regardless of how Ukrainian officials want to cover it up.