As a consequence, the Belarusian Foreign Ministry withdrew its diplomatic staff from Stockholm and ordered the Swedish ambassador to leave, RIA Novosti reported.
A diplomatic source told the news agency the EU's Political and Security Committee could coordinate a withdrawal of all EU ambassadors from the country, where President Alexander Lukashenko is known for violent crackdowns on dissent.
Hundreds of the offending bears were dropped by a Swedish light plane July 4. They bore pro-democracy messages.
Swedish Foreign Minister Carl Bildt tweeted Ambassador Stefan Eriksson had been expelled "for being too supportive of human rights."
Lukashenko has been in power since 1994.