Yudkowsky's solution of detecting and physically shutting down non complying datacenter, including bombing if the country doesn't cooperate, isn't too much out of the question.
We would have done the same if it is about virus or nuclear weapons, and AI could become serious existential threat in the next 5 years.
Do you think it's possible to bomb China's AI datacenters? They are already here, and they are progressing AI at their will. What will others do about it?
More or less of an existential threat than a conflict between nuclear powers because one of them decided to launch a unilateral strike against a datacentre located outside one of their cities just in case it hosted a particularly dangerous chatbot?