You are, in fact, either suggesting that or are entirely unaware that Ukraine had a peaceful agreement with Russia prior. The entire point of giving Ukraine official sovereignty was to reduce international pressure on Russia - everyone knew that reneging it would bring war to Russia's doorstep, it's written in black and white on the Budapest memorandum.

You can blame Russia for not knowing their worth, but they did break the treaty and there is no rational justification for doing so.