Britain

"We cannot let dictators do as they wish under the threat of their nuclear weapons. It's a grim spectre over us all, yes, and Britain will not be using nuclear weaponry in this conflict out of concern for the civilians, but if we just let anyone who has a nuke do whatever they wish because we 'might' end up in a nuclear war, this world will be a poor place to live.

Sometimes, somewhere, we will have to make a stand. If the government of Hegemony has any sense, they will step down and avert war. If they resort to the nuclear option...

...well, we would be right in deposing such people, no matter the cost. They don't deserve to be leaders."