USSR's borders were not changed by external powers. And England? Do you mean the end of Empire? I'm not sure on the dates but it mostly predates nuclear deterrence.
If you are not sure you can google "European border changes over the past 100 years" and also Google "Dates that countries became nuclear"
As far as the USSR collapse having nothing to do with external powers, that is an interesting take, I thought the Cold War was a big part of it, but maybe not?
