5085
Ukraine acting president says military operation in northern Donetsk region has begun , Interfax says http://t.co/kMaAkXL79U
 Ukraine, northern Donetsk region, Interfax
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ukraine, northern Donetsk region, Interfax