Ukraine Prime Minister Viktor Yanukovych showed no signs of giving in to pressure to step down, insisting he would challenge the results of Sunday’s presidential vote that gave opposition leader Viktor Yushchenko a solid victory.

Noisy, orange-clad opposition protesters blockaded Ukraine’s government headquarters in Kiev today and prevented Prime Minister Viktor Yanukovych from convening a Cabinet session.

Opposition leader Viktor Yushchenko savoured his apparent victory in Ukraine’s presidential election rerun today, but his opponent’s supporters vowed to challenge the results in court in what could be yet another protracted legal battle.