What you don’t seem to understand is Putin doesn’t negotiate in good faith anyway, it has been proven over and over the Russian Government will lie, cheat, steal, whatever to get what they want. Appeasing dictators does not work and only strengthens them for their inevitable march on to attempt to gain more power/land/money.
Man if only there was some example prior to the invasion of Ukraine where the west did nothing, and Russia then continued to escalate, something like Crimea?