No it is not separate.
It is all international relations, and if you are unwilling to look in a mirror to discuss US policy, past and present, then you can not provide your basis for an argument regarding a sovereign nation's right to peace in your own interpretation.
A nation can walk around talking about their black belt training and their good buddies who "got their six." They can display a fake persona of peace and prosperity while conducting business in a manner that upsets everyone around them. It does nothing to prevent that nation next door from stepping up, throwing out a jab which breaks their nose and renders them unconscious if the timing is right.
Will that attacker take them hostage and make them a slave forever? That is the unknown.
US policy doesn't dictate morality. Again, if you'd like to discuss US policy in handling of Iraq, start a topic on it. This is a topic about whether Putin has moral authority to attack a sovereign nation who hasn't threatened him or attacked him because they don't do what he wants them to do.
