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US sources with authoritative knowledge of the Beijing meetings said the head of the North Korean delegation Li Gun had confirmed to US envoy James Kelly that the Stalinist state had developed nuclear weapons and hinted it may sell or use them , depending on US actions .
 them: artifact; it: seller
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: transfer ownership 
  Option: artifact, seller, place, beneficiary, buyer 
Text: {0} 
Answer:
 them: artifact; it: seller