And to think the current US policy was aimed at maintaining peace:

Is Ukraine about to go nuclear again?

The actions of Russia and Ukraine over the next few weeks have the potential to alter the global nuclear weapons dynamic in a profound and extremely dangerous way.

One probable and immediate consequence of a Ukrainian choice to "go nuclear" would be that Belarus, a Ukrainian neighbor and close Kremlin ally, would also choose to return to its pre-treaty nuclear weapons status through the development of indigenous weapons or, even more likely, invite the placement of Russian nuclear weapons within its borders.
Japan would be well advised ....