Well, that is an inauispicious start to this article. Putin never launched an invasion of Ukraine. You do not conquer a country of 46 million people with an expeditionary force of 190,000 troops. You do not capture a city like Kiev with 3 million people by sending 40,000 troops in a column.
For reference, Hitler needed 2 million men to conquer Poland.
No. Putin sent in the troops to pressure Kiev to come to the negotiation table - WHICH THEY DID, in Istanbul one month later.