According to Professor Boris Dolgov, Russia’s foremost scholar on the Middle East and expert on the Syrian crisis, the comments by Western politicians and media alluding to a Russian reversal are intended to increase pressure on Moscow. In reality, Russia’s stance at the Security Council remains steadfast. Besides, it cannot do otherwise, since a regime change would immediately lead to a war against Iran, followed by an attack on post-Soviet states of Central Asia...
http://www.voltairenet.org/The-Situation-in-and-around-Syria