The path back to sanity is thorny but not impossible:
One: re-join the Anti-ballistic Missile Treaty, thus making Russia's medium range missiles unnecessary, and reduce tensions between the US and China by withdrawing ABM systems from Japan and South Korea.
Two: re-instate the Intermediate-Range Nuclear Force Agreement and find a way to bring China, India and Pakistan into it. That will require a general reduction of US military forces in Asia coupled with an agreement with China to back off on its claims over most of the South China Sea. Tensions between India and Pakistan would be greatly reduced by simply fulfilling the UN pledge to hold a referendum in Kashmir. The latter would almost certainly vote for independence.
Three: continue adherence to the START Treaty but halt the modernization of the Big Five's nuclear weapons arsenals and begin to implement Article VI of the NPT in regards to both nuclear and conventional forces.
Pie in the sky? Well, it beats a mushroom cloud..
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