"Rerunning the second round of the elections will provide an opportunity for Ukraine to demonstrate that its people's undoubtedcommitment to democracy can be translated into well-organized, free and fair elections," Solomon Passy, president of the pan-European security body, said in a statement from Sofia.

"In particular, we expect to see a fair campaign and unbiased reporting in state-controlled media," said Passy, who is also Bulgarian foreign minister.

Passy's comments came after Ukraine's Supreme Court annulled the Nov. 21 presidential run-off amid widespread allegations, including from the OSCE, that the vote was rigged in favor of the country's Prime Minister Viktor Yanukovich.

The supreme court also ordered a new poll on Dec. 26, as demanded by the opposition.

"The supreme court's decision confirmed the information gathered by observers from the OSCE and other organizations reporting serious breaches in the two rounds of the election," he said.

Passy said the court's decision "will enable a peaceful resolution to the crisis to be found."

In the statement, he also urged Ukrainian officials to allow international observers full access to the re-run.

Observers "must be allowed to monitor the integrity of the electoral process without hindrance, including the counting of votes," he said.

Passy was speaking ahead of an OSCE ministerial meeting in the Bulgarian capital of Sofia, which starts Monday and will be dominated by Ukraine's voting crisis.