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If the United States has officially restored diplomatic relations with Yugoslavia , President Clinton announced the move during his visit to Vietnam , calling the changes in Yugoslavia remarkable , following the democratic election of President Vojislav Kostunica and the ouster of Slobodan Milosevic .
 the United States, Yugoslavia, Clinton, Vietnam, Yugoslavia, Vojislav Kostunica, Slobodan Milosevic
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:
 the United States, Yugoslavia, Clinton, Vietnam, Yugoslavia, Vojislav Kostunica, Slobodan Milosevic