disagree completely, Russian intent in Syria is to prevent the fall of the government, and that means Assad stays.There is no viable options among any of the so called opposition anyway, they're all a bunch of terrorist jihadi loons.
According to you. Russia doesn't care a single bit about the Assad or his government. They're doing it due to geopolitics.
Russia already have Crimea, that's not even up for discussion
what they have said about Assad is wrt an eventual settlement
after the war is over, he's not going anywhere for now till the jihadis are cleared out, and not just ISIS, but the rest of them too.
The reason why Russia's economy is suffering is due to sanctions that were put up, because of their invasion and annexation of Crimea. Russians realize that they need to do something, or the annexation will be worse than worthless, it will drain Russia's coffers.
As for Assad, Russia has indicated that Assad is disposable, but because of politics, they haven't actually out right said Assad should go. If Russia said it, their entire campaign would lose it's entire purpose, making it impossible for them to achieve their goals. The truth is, Russians don't care who's in charge in Syria, as long as their goals are met; this has always been the Russian way.
You have to look at reasoning, not just actions.
Turkey have been involved in supporting the so called rebel forces from day 1, they have also been the main point of entry for foreign jihadis (both ISIS and others) to enter Syria. No question of 'if' when they've repeatedly stated their goal of removing Assad from power and have been using 'rebel' forces to engage the SAA forever.
The "if" is for "if they succeed", and we can only know that once the Turks implement their plan successfully.
I don't think there is any chance of overt Turkish military action in Syria to enforce regime chance, specially now that the Russians are there.
I think there is, but even if the Turks don't go for regime change, they WILL go for the safe zone. The Turks main worry is the Kurdish forces, they will be Ankara's main target, along with ISIS. Assad is a secondary objective, nothing more. I can see Turkey using the same excuses that NATO used in Libya, to target bases where Assad and his inner circle are hiding.
Russian might is overrated. I have zero doubt that Turkey has the backing of both the US and KSA, and I have zero doubt that both are actively collaborating with Turkey; With Turkey, USA, and KSA, Russia hardly stands a political chance.