Obama was the one who decided to get involved in Syria civil war, militarily and with proxy fighting forces. The proxy fighting force later became Islamic State. It is simply a continuation of the invasion of Iraq, the goal is to take over Syria too. Such a take over means U.S. can plunder all the riches of Syria, as it did with Iraq. Strategically, Afghanistan, Iraq and Syria, along with NATO, forms a full unbroken military encirclement of Russia western front. The final goal is the defeat of Russia, render it powerless for capitalist plunder. Maintain America as sole superpower.