@Blickers,
While I tend to agree with your basic position that,in seizing the Crimea, Russia's violation of the sovereign rights of the Ukraine had nothing to do coming to the rescue of ethnic Russians living in the area or a long established territorial claim, your argument in support of it is weak.
Do you contend that the Russian government in 1991 was a model of truth and morality, and/or that's its foreign policy decisions bound all future Russian governments for all time?
At some point in the future, someone will offer up the argument "Then why did the US in 2018 (fill in the blank)?" Somehow I don't imagine that you will concede the debate and acknowledge "Yeah, you're right. The Trump Administration set a precedent which binds all US administrations since then."