Facts based on stereotyping actions? Is that how you "know?"
Like I said., common sense, a the process of elimination and then history. For one thing, common sense would tell you that not a single rational Putin has provided is anything other than a LIE. In the first place, Putin has been tossing out new rationalizations looking for one that would stick to the wall from the start. In other words, hunting for something that he could sell.....like Trump hunting through his rally crowds for something that drew the most applause. None of what Putin has tossed out there is anything more than a means to try to justify this mess first to his own domestic audience and then to whatever part of the world might need something to latch onto in order to support what in truth is a war of conquest.
- Putin started his string of excuses for this war with fear of NATO which he knows is a defensive treaty alliance. Putin is not stupid. You can do one of two things. You can take Putin at his word over this excuse which is the equivalent of Putin saying "I don't want Ukraine becoming part of NATO because it will be harder to conquer it" or you can determine that Putin did not even think that hard about this excuse. Its just a flat out LIE!
- then he went on to the ethnic Russians and Russian Language restrictions and Donbas garbage. Putin's war is not about the rights of ethnic Russians in Ukraine either. Between his own loses and a simple cut of the overall percentage of the Ukraine population that is ethnic Russian Putin is killing more ethnic Russians than Ukrainians. So you can take all of Putin's horse shit excuses about the rights of ethnic Russians and toss them right out the window. That includes the Donbas region excuse and the Russian language excuse.
- finally Putin comes up with Ukraine developing nukes which is ludicrous since they gave up their nukes and bio-weapons development which is equally ludicrous.
The closest Putin came to a goofy as hell excuse that you can at least say has crossed his mind in some relevant way is his argument about the Communists first having designed the Soviet Union and then seeing the Soviet Union capitulate. I can see that putting a hair across Putin's ass. But its still a bullshit excuse. Get over it Vlad. Shit happens. No matter how you cut it, just because Ukraine was a Republic of the Soviet Union did not leave Russia, simply another Republic of the Soviet Union any legitimate claims to Ukraine. Sorry Vlad.....illegitimate and irrational to boot. I can see Putin building up a rationalization for attack over this argument but not because it makes any sense but instead because.......PUTIN! No Vlad, you don't get Vlad because it was once part of the Soviet Union and oh by the way, you don't get Alaska back either.
Once you have eliminated all of Putin's bullshit you are left with history. You are forced to start thinking about the reasons for this war that exist outside what Putin has told us. That leads us to history, particularly the history of the 20st century, The history of war and especially the history of war in the 20th century which is a history of conquest.
Leaders of nation states go to war for conquest, for the treasure and assets of other countries. Not only does it make the most sense based on history it makes the most sense based on assets. Putin has been trying to take over Ukraine's assets for over a decade by means other than war. The combination of Ukraine and Russia would account for 70% of the world's grain exports. Its another version of his fossil fuels gig only to a different part of the world than Europe.
This war or the reason Putin embarked on it is not at all difficult to figure out. His problem in total is that he had a fugged up pretext, had a fugged up plan and a fugged up paper tiger of a military asset.
Oh ....and Putin's denazification of Ukraine excuse does not even merit inclusion in the list above.