It is seriously not hard to understand. Russia has ALWAYS been neurotic about its border because its fucking GIGANTIC and impossible to defend every inch of it. The West (particularly the United States) pushing for Ukraine to join NATO was seen as a MAJOR act of aggression and possibly an act of war by Putin. He has constantly warned the West to back off of doing it, and they've never done it. Russia has tried to constantly fuck up Ukraine to prevent this, but this strategy was no longer working. The invasion of Crimea already restored access to the Black Sea.
This is all about Western interference and having Western military bases right on its border. This was unacceptable. Of course, the reason the US did this was for Biden to make up for a failing domestic agenda, so he basically pushed Russia into it. And of course Putin knows Biden is incredibly fucking weak, he just underestimated HOW weak. Make no mistake, Biden's weakness and goading of Russia into this is going to create all sorts of problems in the future.
Everyone is worrying about WWIII, but the Biden administration's colors have been revealed in full and will create giant foreign policy problems. All our enemies have to do is invade after Biden's bedtime and we can't do fucking shit. Again, its easy. Russia wants to prevent a Western alley from right up against its borders for an easy strike into Russian territory. All we had to do to prevent it was NOT be 'strong' on Ukraine joining NATO.
Exactly. Which is why nothing is going to happen. This was a major blitz and our commanders have no fucking clue on what to do. We've lost military exercises to other nations like Britain. The fact that our military can't do shit without a commander in chief and that person has fucking dementia is quite an obvious weakness, though I doubt our founding fathers figured we weren't retarded enough to elect someone who is completely senile. Too bad we were.