That's not how I interpreted it: "...if Ukraine should become victim of an act of aggression or an object of a threat of aggression in which nuclear weapons are

That's not how I interpreted it: "...if Ukraine should become victim of an act of aggression or an object of a threat of aggression in which nuclear weapons are used." I interpreted that as either conventional aggression, or threat of nuclear aggression. The language does seem really ambiguous though. I'm surprised it wasn't written more clearly.