Wow, I can only remember the democrats abandoning S. Viet Nam, Iraq, Libya after coming back into the fold, and their reversals of almost every single foreign policy policy or treaty signed by republicans. At least Bush only abandoned his own so to speak - are there more instances of republicans abandoning a US ally? Bay of Pigs - democrats - a long socialist propelled policy.
I’m no expert in this area, but we did encourage Iraqis to fight for us under both Bushes, and then walked away.
As I’ve said, there may not have been a practical alternative to the walking away part, but we quite possibly could have been more upfront about our plans with possible allies.