General Discussion
In reply to the discussion: Report of poisonous substance dropped on Mariupol [View all]A nuke om a non-NATO country does NOT invoke Article 5, nor does our US Constitution provide for the President to launch a counter-strike against Russia. That would take a declaration of war, and we all know that a declaration of war is highly unlikely.
Use of Chemicals would be a different level of concern, but again, would require Congress to authorize the use of force. I don't know if there is sufficient World opinion, or US public consensus at this point. We'd probably have to draw it out for weeks while our Congress debates whether or not to declare war or authorize force.
The fact that Ukraine is NOT a NATO member right now makes it very, very difficult to justify use of force, even for something as dastardly as use of Nuclear or Chemical weapons.
The UN and the International Courts are the only real hope for justice to be administered, I'm afraid.