I mean, I don't think I need to point much of the historic parrallels that can be pointed out right now with the current political situation and what was happening in 1930's Europe when Nazi Germany decided to annex Sudetenland and other german speaking territories to further their "Vital Space".
Hitler didn't have nuclear weapons. If Russia didn't either they wouldn't be invading. Or if Ukraine had them too.
You can bet you'll see many, many countries developing nukes this century.