Ukraine's opposition leader Vitali Klitschko said on Wednesday that he has quit talks with President Viktor Yanukovich without reaching any agreement on how to end the violence in Kiev, local media said.

"Unfortunately, I bring nothing good from the talks," Ukrainska Pravda website quoted Klitschko as saying.

He said that he left the talks after the president demanded that the central square in Kiev occupied by anti-government protesters be unconditionally cleared.

It was not clear from the report whether talks between the president and the two remaining opposition leaders were continuing.