both of these readings are valid:
(should become a victim of an act of aggression) or (an object of a threat of aggression in which nuclear weapons are used)
((should become a victim of an act of aggression) or (an object of a threat of aggression)) in which nuclear weapons are used
english is ambiguous in this case. don’t be dismissive of people for “reading comprehension” when it’s definitively ambiguous
yup… i reread and realised i’d misread your comment and so deleted mine