Definition: In this task, a passage will be given and the goal is to identify an event from the passage. An event is defined as a single word representing something that happened, is happening, or may happen. An event can be factual or hypothetical, positive or negative, certain or uncertain. While most events are based on verbs, an event can also be based on a noun (ex. storm, snow, rainfall) or a copula verb (is, was, been, etc.). The event must not be a pronoun or an adjective. For noun events with multiple words, use the last word in the phrase as event.
Input: Passage: It asks the head of the Vienna-based International Atomic Energy Agency (IAEA) to submit a report within 60 days on whether Iran has fully complied with the demands. It says implementation of the sanctions would be suspended if Iran halts uranium enrichment but warns that failure to heed the UN demands would lead to "further appropriate measures", a reference to economic sanctions.

warns