Not to sound condescending, but if you're remotely interested about mid-east politics it is pretty easy to see what tonight was about. It is about Syria.
Pretty much all the world powers have vested interests in Syria. Russia has started to intervene in Syria very recently. NATO is there from the beginning. There is Iran, Turkey, Saudis, Israel, you name it.
There was supposed to be a G20 event tomorrow (will probably get postponed) and the hot topic was supposed to be Syria. What happened a few hours ago is just diplomacy played with blood.