Many will hate to hear this but the only solution is one world government or at least a unipolar order that reduces the survival need to participate in arms races. Arms race dynamics between nations will be the end of our species.
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In other words, everything would be terrible, but at least it'd be terrible for everyone.
Until we realized we could sacrifice some for the betterment of the rest, find a way to rationalize it, and then we throw it all out the window.