It was the US that proposed the treaty in the first place after the Russians started pioneering MIRV's. The US withdrew from the missile defense treaty as a result of other nations pursuing nuclear weapons and deployment technology. The shift was being made to a more defensive posture. Not only did the Russians not go ape shit over it but soon after (SORT) was signed.

That cut both nuclear arsenals down considerably. Developing new technology to protect yourself is slightly different than new ways to attack IMO. There may be ways to defend against smaller states attacking with nuclear weapons. Nothing changes in a US/Russian MAD war though.

That cut both nuclear arsenals down considerably. Developing new technology to protect yourself is slightly different than new ways to attack IMO. There may be ways to defend against smaller states attacking with nuclear weapons. Nothing changes in a US/Russian MAD war though.
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