[JURIST] Supporters of Ukrainian opposition leader Viktor Yushchenko maintained their siege of government buildings on Sunday. Yuschenko has encouraged supporters to keep up the pressure until President Leonid Kuchma fires Prime Minister Viktor Yanukovych and electoral reforms are approved to ensure that the new run-off on December 26 is fair. Parliament has already voted to sack Yanukovych, but Kuchma has not signed a decree formally dismissing him. Leaders from Poland and Lithuania are expected in Kiev this week for fresh mediation attempts. Reuters has more.