Correct. Syrian conflict was directly a result of infiltration of soldiers from Turkey border and with the aid of small number of ethnic groups like the turk villagers living at the border and even Kurdish group allied with USA. The people of Syria were never against Assad. There was hardly any real issue either as Assad had very little black.marks against him which could make people revolt.
Iran doesn't yet have the infrastructure to export gas. Qatar has well developed infrastructure. Also, Iran is blocked by other Arabs states who don't like Iran while Qatar can be blocked only by Syria & Iran.
Aleo, Qatar buying stake in Rosneft means very little as the company still pays a lot of royalty to Russian state and only a small part is profit. So, most of Rosneft revenue is used to help Russian economy, not the shareholders.
If Qatar gets direct access to EU, Russian state will lose s lot of money and influence in EU
Turkey has its own goals in Syria which just happened to temporarily align with USA and hence allied together. Turkey is in league with GCC and is heavily funded by Arabs indirectly. That is why Turkey stopped buying Iranian oil under pressure from Arabs. Nevertheless, Turkey did something bad for itself in the long run by making the Iranians, Iraqis and Syrians pissed off with Turkey which may have a major backlash in the future. If Turkey wanted to attack, it should have done so independently instead of allying with USA. Allying with USA only brings infamy