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Since the 1980 s , the Soviet Union started offshore drilling for petroleum in the sea 's western portion ( adjoining Ukraine 's coast ) .
 Soviet Union, Ukraine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Soviet Union, Ukraine