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Negotiations between Washington and Pyongyang on their nuclear dispute have been set for April 23 in Bejing and are widely seen here as a blow to Moscow efforts to stamp authority on the region by organizing such a meeting .
 Washington, Pyongyang, their, Bejing, Moscow, the region
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 Washington, Pyongyang, their, Bejing, Moscow, the region