The rule that matter's has always been the same, no matter how much we might play nice and virtuous for a time, there's only room for one top dog and when he shows weakness or hesitance there will be a mob of hungry contenders looking to take his place.
Yes, bottom line, the Bush BS over Saddam set the bar and is really no better than this. We could argue details but bottom line, both cooked up BS and invaded. Personally I think they'll wish they had been invaded by the US rather than Russia, the raping and torture will dwarf what happened in Iraq.
But coming back to that first rule,