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A Japanese official announced today Wednesday that Japan and Russia are to hold a summit before the end of the current year in an attempt to find a solution to their dispute about the Coral Islands , which has hindered the signing of a peace treaty between the two countries since the end of World War II .
 Japanese, Japan, Russia, their, the two countries, A Japanese official, the Coral Islands
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 Japanese, Japan, Russia, their, the two countries, A Japanese official, the Coral Islands