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South Korea and Japan were cautious , with Seoul Foreign Minister Yoon Young - Kwan saying if the North Koreans were telling the truth , it would represent a " major " threat to peace in Northeast Asia .
 South Korea, Japan, Seoul, the North Koreans, Seoul Foreign Minister, Seoul Foreign Minister Yoon Young - Kwan, Northeast Asia
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:
 South Korea, Japan, Seoul, the North Koreans, Seoul Foreign Minister, Seoul Foreign Minister Yoon Young - Kwan, Northeast Asia