I think the best thing any nation can do to defuse the situation here is to just walk away. It's lesson one of most martial arts. If you can, just walk (or run) away from an attacker instead of escalating things to try and save face or to get one over on your attacker or whatever. Fighting should always be a last resort.
It's the best way to avoid getting killed.
If the US just fucked off, withdrew all their troops, shut down all bases, and stopped sticking its nose into things that don't concern it, and went back to their own country and let international events just sort themselves out between the affected parties, then we would have a lot less to fear. I don't think they know how to stop anymore.
Their ego and desperate need to control everything is going to kill us all, I think.