> While nobody actually believed Putin would be dumb enough
I'm not sure why you'd say nobody thought they would invade. To me it was clear in December the year before when the Russian navy began sailing the long way around Europe, getting in the way of Irish fisherman and confirmed days before the invasion when they had stockpiled medical personnel and blood on the front lines.
When the US warned, days before, of the imminent invasion, the broad reaction was still one of "the boy who cried wolf"