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://web.archive.org/web/20140317182201/http:/www.cfr.org/arms-control-disarmament-and-nonproliferation/budapest-memorandums-security-assurances-1994/p32484

https://www.nytimes.com/2022/02/05/science/ukraine-nuclear-weapons.html