We’re not going to go to war over Crimea.
The Ukrainians know this is too and Obama is not a reliable ally.
What I am pointing out is one has to make the best of a bad situation. This is what Kiev is doing in signing the agreement with the EU.
And we’re not exactly in a position to save Ukraine, if Russia breaks its word but we can resist Russian adventurism elsewhere.
I didn’t mention fighting a war.
Going soft now and ignoring internationally recognized borders because Putin pretends to be scarey is the most likely path to fighting a war.