Since Friday evenings attacks, French officials have repeatedly declared their desire to see a grand coalition of nations fighting ISIS, with President Hollande saying its time to put aside diverging interests and unite against ISIS in general.
This comment is pointed squarely at the current divide in the ISIS war, with the US-led coalition fighting one anti-ISIS war, and several other nations fighting ISIS, but being excluded by the US. Russia is the biggest of these nations, and the US seems eager to keep it that way.
Speaking during his visit to the Philippines, President Obama insisted Russia needed to be kept out of their coalition right now, and that the US intends to wait and see if Russia gets closer to the US position on a diplomatic settlement at the Vienna talks.
Russia has been calling for reforms leading to free elections, while the Obama Administration demands the exclusion of President Assad and other top figures in the existing Syrian government from any post-war government. Officials seem to hope they can leverage Russias desire to get involved in the coalition to get them to make concessions on the reform plan.
Whether thats going to work out remains to be seen, but Russias primary goal in its involvement in Syria is to assure they retain their naval base at Tartus, and they are unlikely to willingly allow the entire government theyre allied to to be simply expelled in favor of pro-US rebels in the hopes that theyll be allowed into the bigger coalition fighting ISIS.