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Ukrainian opposition leader Arseniy Yatsenyuk, left, walks past Pro-European Union activists gathered in their tent camps on the Independence Square in Kiev, Ukraine, Wednesday, Dec. 11, 2013. Security forces clashed with protesters as they began tearing down opposition barricades and tents set up in the center of the Ukrainian capital early Wednesday, in an escalation of the weeks-long standoff threatening the leadership of President Viktor Yanukovych. (AP Photo/Sergei Chuzavkov)
EU foreign policy chief Catherine Ashton (R) and Ukrainian opposition leader Arseniy Yatsenyuk visit protesters in Independence Square in Kiev on December 10, 2013. Ukrainian President Viktor Yanukovych held talks with Ashton and his three predecessors to seek a way out of an explosive standoff with protesters, warning that opposition calls for a revolution were a threat to national security. AFP PHOTO/ SERGEI SUPINSKY
Ukrainian opposition leader Arseniy Yatsenyuk, left, and EU foreign policy chief Catherine Ashton, center, and former Ukrainian Foreign Minister Vladimir Ogryzko, right, arrive to meet Pro-European Union activists gathered on the Independence Square in Kiev, Ukraine, Tuesday, Dec. 10, 2013. Some demonstrators arrested in the massive protests sweeping Ukraine's capital will be released, embattled President Viktor Yanukovych promised Tuesday, trying to defuse a political standoff that is threatening his leadership. (AP Photo/Andrew Kravchenko)
Ukrainian opposition leader Arseniy Yatsenyuk speaks to protesters outside Parliament after its session in Kiev, Ukraine, on Tuesday, Dec. 3, 2013. Ukraine's opposition has failed Tuesday to force out the government with a no-confidence vote in parliament, leaving the country's high political tensions unresolved. (AP Photo/Sergei Chuzavkov)
KIEV, UKRAINE, DECEMBER 1 2013: Arseniy Yatsenyuk, a member of parliament, marches ithrough central Kiev to a large rally on Independence Square where hundreds of thousands of people demonstrated in favor of EU integration and to demand the resignation of President Viktor Yanukovych.
Leaders of the pro-European Ukrainian opposition Vitaliy Klitschko (2nd L) and Arseniy Yatsenyuk (L) walk in front of riot police surrounding the Ukrainian Cabinet of the Ministers during a protest in Kiev on November 25, 2013. Pro-West Ukrainians staged the biggest protest rally in Kiev since the 2004 Orange Revolution, demanding that the government sign a key pact with the European Union. The opposition called the rally after President Viktor Yanukovych's government reversed a plan to sign a historic deal deepening ties with the European Union, in a U-turn critics said was forced by the Kremlin. AFP PHOTO/ SERGEI SUPINSKY
Ukrainian opposition leader Arseniy Yatsenyuk, left, and Eugenia Tymoshenko daughter of jailed former Ukrainian Prime Minister, Yulia Tymoshenko sing the anthem during a protest in Kiev, Ukraine, Sunday, Nov. 24, 2013. Tens of thousands of demonstrators marched through central Kiev on Sunday to demand that the Ukrainian government reverse course and sign a landmark agreement with the European Union in defiance of Russia. The protest was the biggest Ukraine has seen since the peaceful 2004 Orange Revolution, which overturned a fraudulent presidential election result and brought a Western-leaning government to power. (AP Photo/Sergei Chuzavkov)
Polish Foreign Minister Radoslaw Sikorski (R) meets on October 22, 2013 in Kiev with the leaders of the Ukrainian opposition, Oleh Tyagnybok (L), Arseniy Yatsenyuk (2nd L), Vitaliy Klitschko (2nd R) and the daughter of jailed opposition leader Yulia Tymoshenko, Yevgenia (C). European parliament envoys arrived in Kiev on October 21 to try to secure a deal for Tymoshenko to leave the country, as EU ministers urged Ukraine to step up reforms ahead of a historic accord, due to be signed in Vilnius on 28-29 November, which would set Ukraine on the path to EU membership. AFP PHOTO / SERGEI SUPINSKY
Ukrainian opposition leader Arseniy Yatsenyuk speaks during a news conference in Kiev, Ukraine, Tuesday, Oct. 30, 2012. Ukraine's parliamentary election was marked by an uneven playing field and biased media coverage that reversed many of the democratic gains the country had made in recent years, international observers said on Monday, and opposition leader Yatsenyuk said, "People are going onto the streets because they feel like it and politicians can not dictate to them. When people see that the results of the elections have been stolen like it was in 2004, they head to the streets to defend their votes. (AP Photo/Sergei Chuzavkov)