The Budapest Memorandums disprove your argument. Long before Russian invaded Crimea, much less Ukraine main, a peace plan with a promise to never invade was given by Russia. Russia lied.
https://www.nytimes.com/2022/02/05/science/ukraine-nuclear-weapons.html
If Trump is found guilty, and was sentenced for all of his crimes to be served consecutively, it adds to over five hundred years, according to Trump himself. That almost never happens, though. The maximum sentence of the three most severe crimes is twenty years/each. Any likely sentence could be a life term, given his age. IANAL though.