The circumstances are entirely different. We all saw how Putin was holding back for what seemed ages, leaving the West guessing why. It was clear he was trying to assess what the reaction to his invading would be, clearly nervous about it not being too great, such as a NATO response.
In other words he didn't want war beyond the quick fall of Ukraine he planned for, akin to that of Georgia.
If at any time during that long waiting period Ukraine had made the right sort of approach, showing empathy with the Russian position and negotiating to meet Russian needs without any Ukrainian loss, there would be no war now.
It's important to remember or be aware that for the whole of the 20th century Russia and Ukraine enjoyed good relations, with Ukraine a privileged partner. That only ended with the deliberate destabilising of Ukraine by the USA, the consequence being the long standing civil war in Ukraine.
An agreement on the lines I suggest would immediately automatically end that civil war, two birds killed with one well aimed stone.
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