I would recommend looking at the Norwegian system, where each region elects multiple candidates proportionately to the local votes, and all parties above a certain percentage nationwide shares a pool proportionally as well. It’s not perfect, but it gives a sane amount of different parties without the inevitable deadlocks of 100-party systems. The national pool limit can tune the approximate number of viable parties.

I would have agreed with you if I thought such a war could have been fought conventionally, but a single nuclear missile slipping through the air defenses would be too high a cost to pay for anything outside NATO.

And how could we do that without Eastern Europe, London and Paris being turned into self illuminating parking lots?