This is a bad incident, but I do not believe that a major war is about to break out; this isn't the cold war anymore, and the major powers are actively avoiding

This is a bad incident, but I do not believe that a major war is about to break out; this isn't the cold war anymore, and the major powers are actively avoiding war with each other because neither can bear the consequences of such a war. If you read the article, you will see that even Putin is treating this as a one-off event that occurred as a result of poor coordination between the parties ostensibly united in attacking ISIS. The Russian anger is focused largely at Turkey, who is the ally nobody wants to have in the fight against ISIS... it's no secret that the Turkish MIT (intelligence agency) has been caught transferring weapons directly to radical Sunni groups near the border while killing Kurds whenever possible. I think the overarching idea of this incident is that everyone knew that an accident would happen eventually, and so a mature response is to take steps to increase coordination rather than saber rattle about a downed aircraft. A complication is that the Russian pilot who survived the crash was captured by rebels; I assume Russia will deal with this swiftly.