KIMBERLY MARTEN:

I think we have a look at what's actually been happening on the ground, it's cause to have a lot of confidence that both sides are actually trying to tamp down the situation and make sure that it doesn't escalate beyond the current situation. So we know that the U.S. had and the British and the French had some contact with the Russians in advance using the Syria deconfliction line to maybe reassure the Russians that no Russian installations in Syria would be hit. We know from the Russian side that they did not activate their own missile defense systems and so it just is an indication that the deconfliction line is working. That at least the military's on both sides want to keep the crisis limited even though the rhetoric coming from politicians in Russia has been a lot stronger.