Ukraine

I don't think it's a positive for anyone. Putin was shown to have an extremely tenuous grasp on power. Prigozhin is figuratively defenestrated and will soon be literally defenestrated. This can't be good for morale--either for the Wagner people or the regular Russian troops.
You mean any Russian, correct?

This is definitely good for Ukraine. Not as good as it could have been had it been real, but still a net positive for them.