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As European Union leaders restated their opposing views on Iraq , their foreign ministers debated the impending U . S .- led war against Iraq with EU president Greece keeping up appearances with a pledge to pursue a last ditch effort to avoid war .
 U . S: attacker
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: attack 
  Option: victim, attacker, place, target, instrument 
Text: {0} 
Answer:
 U . S: attacker