I can see that the news are being shared here very fast, so you probably already mentioned it. Sorry if I missed it. There is a possibility, among many other reasons, that Putin made the final decision to begin this operation because there was info (including words from Zelensky) that Ukraine will work on having or using nuclear weapons. Ukraine also decided to cease from the
Budapest Memorandum.
This is a full stop and a very solid reason to go in and put a total and final stop to whatever goes on in Ukraine. Otherwise it would pose a grave danger to Russia.
There are still questions if Biden and Putin had prior agreement, as was explained by Khazin (in order to distract from the upcoming economic chaos in US). It's quite possible that this is the case. But it really doesn't matter. Either way it's clear that the West will impose "further serious sanctions" on Russia.
Well, as you may have heard from Putin, he and others from his team don't care about that at all. Khazin also said that right now no sanctions are going to have any real or serious effects on Russia. I mean, sure, they will to a degree, but Russia will be able to bounce back. The West will only hurt itself.