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Ukraine's opposition Friday sat down for a tense round of talks with President Viktor Yanukovych for the first time since mass protests broke out three weeks ago but said he had failed to meet their demands. The talks came amid mounting tensions ahead of what could be a potentially explosive weekend in Kiev, with both the opposition and supporters of the ruling Regions Party vowing to hold mass rallies in the city centre. The three main protest leaders -- world boxing champion Vitali Klitschko, nationalist leader Oleg Tyagnybok and the head of the party of jailed opposition leader Yulia Tymoshenko, Arseniy Yatsenyuk, -- were all in attendance. In a tense encounter, the trio sat on the other side of a long rectangular table from Yanukovych, but not directly opposite him.