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Poland revived diplomatic ties at ambassadorial level with Yugoslavia in April but economic links are almost moribund , despite the end of a three-year U.N. trade embargo imposed to punish Belgrade for its support of Bosnian Serbs .
 location: Yugoslavia; location: Belgrade; location: Poland; organization: U.N.; else: Bosnian Serbs
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 location: Yugoslavia; location: Belgrade; location: Poland; organization: U.N.; else: Bosnian Serbs