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Hundreds of thousands of Ukrainians flooded Kiev for a protest against President Viktor Yanukovych on Sunday as authorities opened a criminal probe into attempts to seize power in an increasingly tense standoff with the opposition. Waving EU and Ukrainian flags, the protesters filled Kiev's iconic Independence Square and surrounding streets to bursting point to denounce Yanukovych's rejection of an EU pact under Kremlin pressure. Jailed ex-premier Yulia Tymoshenko said the opposition was demanding the "immediate" resignation of Yanukovych, in a no-holds-barred statement read by her daughter that was met with chants of "Resign!" from the crowds. "He is no longer the president of our state, he is a tyrant who must answer for every drop of blood that has been shed," Yevgenia Tymoshenko quoted her mother as saying, a giant portrait of the former prime minister sitting next to the stage.