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After talks in Saint Petersburg ' s grand Konstantinovsky Palace , they also warned North Korea to abandon its nuclear aspirations and signed documents implementing the Moscow Treaty , which mandates sharp cuts in Cold War nuclear weapons stocks .
 Konstantinovsky Palace: place; they: entity
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: meet 
  Option: entity, place 
Text: {0} 
Answer:
 Konstantinovsky Palace: place; they: entity