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Japan expanded into areas of China and Indochina which had no strategic value to her , but put her in a position to threaten British and Dutch possessions in the area ; possessions that both those Allied nations needed in order to continue their fight against Hitler .
 their: 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:
 their: attacker