Leader of the Movement of New Forces Party, former governor of Odesa region and ex-president of Georgia Mikheil Saakashvili has called on Ukrainian President Petro Poroshenko to stop attacks on his supporters.
"I appeal to Poroshenko: Why do you need these provocations? Do not attack or force people into fighting back! This is a peaceful rally! Has the experience taught you nothing?" Saakashvili wrote on Facebook on December 6.
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Later, the police said they had chosen the assault because they were carrying out an operation to search for Saakashvili, who is on the wanted list.
The law enforcers also claimed activists had attempted to provoke them during the operation.
None of the protesters has been detained, the police said.
About 10 people were reportedly injured as a result of clashes between the police and the protesters.