Im aware of the speeches.
Speeches dont motivate wars. It's internal politics/justifications to sell the war at home
You have to ask yourself why the redlines letters -
if Biden had taken the opportunity to negotiate would the war started?
Would Putin put himself in the position of starting a war during negotiations over Russian security? no
NATO expansion and militarization of Ukraine made the situation untenable
NATO is a minor grievance.
Putin has basically meekly and submissively accepted Finland's and Sweden's application to NATO.
The is issue, was, and always has been that Russian nationalists cannot bear the thought of Ukrainian independence, which they have always considered part and parcel of Holy Mother Russia.