You are reasoning like a war is lurking around the corner, it's not.
War between the US and Russia is not viable and there is no country that has any interest in "opposing" the US.
I really thought, that we all as a species had by now realized that war isn't an acceptable solution to disputes.
In Europe we have, but I suppose it's hard to understand when you never really have had a war at home base in the last 150 years.
That is not Obama being flexible, that is the US being the US and not giving a crap because Pakistan can't do anything.