Putin wants and has always wanted Ukraine and has stated that it has never been a sovereign state. Thus, one argument by him is as good as another. They all come back to "I want it so, I am going for it when the going looks good." Cuba 1962 analogy/chesnut the Putin apologist are seemingly required to use is complete bullshit and if anyone has a need to understand why then say so and I will give you the proper way of looking at it.
And there is no life in a world of lies, cheating, deceit, nepotism, immorality, and chronic corruption.
The second Ukraine signs an agreement that it won't join Nato nor the EU not a single bullet will be fired. Ukraine has not by far made this concession (yet), though it will.
Get back to me when reality sets back in .... in about 20 years or so, if at all. But yes you have a great rest of your day too in your world.
Ukraine's best option is to not negotiate whatsoballsout and continue this fight. Do not let Putin get off the hook here.