Definition: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Input: Sentence: 'The Europeans and US could face difficulties in referring Iran to the UN Security Council for breaking a moratorium which was voluntary in the first place , and without the IAEA declaring Iran to be in breach of its obligations .', Argument/Subject 1: 'iran', Argument/Subject 2: 'security council'
Output:
be refer to