6 May 2022 - nuke

clue:

On the one hand, we want to deter further nukes. We want an answer that Russia will perceive as painful but not escalatory. On the other hand, neither Ukraine nor Russia will accept a compromise end to the war before they are exhausted. A Russia facing defeat is more likely to lash out, so (counterintuitively) we benefit from stretching out the war. Our action should help exhaust Russia without a large immediate effect on the war. Option A is my best idea so far. I hope that actual experts can think of a better one.