The world was so simple 2 months ago when Russia asked NATO to guarantee and sign agreement that they will not expand further to the East. They explained again and again that placing rockets in Ukraine and Georgia is a red line for Russia. Senile Biden said in an interview that he doesn't care about Russian red lines. The result is what it is. Now they do care but it is too late.
Russia has the right to defend itself!
Since 2016 there are nuclear ballistic missiles in Kaliningrad, between 2 European Union countries. Any disarmament demand by Russia is BS.
Also Russia is asking for respect of its sovereignty, when it is the one invading Georgia, Moldova, Ukraine, and instigating "pro-Russian" sentiments everywhere possible, giving Russian passports, to justify further invasions in former USSR countries.
Yeah it's just old fashioned imperialism. See this article from the future:
https://mil.in.ua/en/news/brave-new-world-of-putin-an-article-by-the-propaganda-publication-ria-novosti-which-was-to-be-published-after-the-occupation-of-ukraine/On the other hand, NATO is also a thing that is trying to grow, as things tend to do. I can imagine the frustration with that on the Russian side. However, no reason to bomb a brother nation to hell.
The funny thing is Putin is accomplishing exactly the opposite of the goal he started out with. A nation's identity is build on stories, and the story that is being written now is that for Ukraine, Russia is a mortal enemy, and Western Europe are friends.