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In the 18th century as a result of the constant wars waged by the Principality of Moldavia and the Ottoman Empire , later more frequent interventions of the Russian army , led to the demise of the region .
 Ottoman Empire
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ottoman Empire