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> He wanted the US to start WWIII with a nuclear first strike on the Soviet Union.

Source?

I'm having trouble finding a primary source, but here's a paper discussing the issue.

Field, A. (2014). Schelling, von Neumann, and the Event that Didn’t Occur. Games, 5(1), 53–89. doi:10.3390/g5010053

I think you are thinking of https://en.wikipedia.org/wiki/Bertrand_Russell Who having visited the Soviet union after the revolution didn't think much of it.