As you have already noticed from various news or students’ blog and comments, Russia reinforces its military presence in Syria, which is one reason placing U.S. in dissidence with Russia. Although Russia’s military build-up may protect himself, many speculations are possible such as that Russia, like China, hates the idea of intervention of third parties, that Syria is a profitable customer buying a lot of Russian military weaponary or that Russia supplies the Assad regime in Syria. In my opinion, the reason why Russia is interested in Syria is the above first one; that is, Russian President Vladimir Putin defies the U.S. led, western-style intervention in Syria. Nevertheless, the ulterior motive is unclear. Whatever the Russian true intention may be, the most important question is doubtlessly, could it be feasible for U.S. and Russia to cooperate with each other?
To conclude, it is quite hard for both superpowers to cooperete, although U.S. and Russia may have the same interest over ISIS. It may be true that U.S. are wiliing to work with Russia against Islamic State and both powers will and can hold the meeting over Syria, it is quite unlikely for Russia to waive the right and interest in this region because, as you know, there is no central authority in the international politics. If Russia and U.S. engage in debate many times in the furture and reciprocate with each other every time, it will become increasingly likely to reach agreement and finally cooperate, but it is easier said than done. As Andrew Kydd says in the article, it might be possible to settle the problem over ISIS without cooperation with Russia. However, as for the Syrian matter, the situation is more complicated than we think.