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Oleg A. Grinevsky , the chief Soviet negotiator in the conventional - arms talks , argued that this would mean the Soviets would have to destroy some 1,800 tanks , while the U.S. would lose none because it has no light tanks in Europe .
 Oleg A. Grinevsky, Soviet, Soviets, some 1,800, U.S., Europe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 Oleg A. Grinevsky, Soviet, Soviets, some 1,800, U.S., Europe