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Ukrainian riot police officers pose for a picture near burnt-out vehicles as smoke rises during clashes with pro-European protesters in Kiev on Wednesday.

Demonstrations that began on Nov. 21 flared into violence on Sunday after the government rushed through a new law effectively banning peaceful protest. Late Wednesday, protest leaders delivered an ultimatum to Ukraine's government -- call elections or we will "go on the attack."

Protesters throw rocks at police in central Kiev on Jan. 22, 2014. Mass protests erupted after Ukrainian President Viktor Yanukovych spurned a pact with the European Union in favor of close ties with Russia, which offered him a $15 billion bailout.Efrem Lukatsky / AP
A woman holds a wooden cross as riot policemen aim their weapons during clashes with pro-European protesters.GLEB GARANICH / Reuters
A protester points a handgun during a clash with police in central Kiev.Efrem Lukatsky / AP