Ukraine's opposition leader Viktor Yushchenko has urged foreign nations not to interfere in the re-run of the presidential poll. West-leaning Yushchenko faces a rematch with PM Viktor Yanukovych, after the Supreme Court ruled that the 21 November poll was fraudulent. Russian President Vladimir Putin has been openly backing Yanukovych. Putin made two visits to Ukraine in the run-up to the original vote. Tens of thousands of pro-Yushchenko supporters continued to hold their rallies in the capital, Kiev, and around Ukraine, buoyed by the court's decision on Friday to stage a repeat re-run. Yanukovych described the ruling as an unconstitutional measure but said he would contest the re-run.