Look how it's turning out for Ukraine. If the USA wanted to avoid this tragedy, they would have a) sent 1000 personnel to East Ukraine just to sit there and play Xbox all day, b) parked a few destroyers in the Crimea region. Had they done that, Russia would never NEVER consider this move.
Don't get me wrong, I fully blame Putin on this, but a deterrent was badly needed. We knew from Nov 2021 that troops were building up on Ukraine border.