An oppositon representative, former foreign minister Boris Tarasyuk, said the new poll "requires a much bigger presence" of observers than the previous runoff, which was enmired in fraud.
The OSCE has already said it wants to field a big observer team.
Outgoing Ukrainian President Leonid Kuchma said today he would honor the Supreme Court's call for a repeat runoff election.
But Kuchma sidestepped the opposition's demand that he sack the government of Prime Minister Viktor Yanukovych, in which parliament has expressed no confidence.
He said such a demand could only be achieved by changing the constitution.
"This [proposed political reform], in my opinion, can provide the answer [to the opposition's demands], including the dismissal of the government," Kuchma said. "If there is such a wish [to sack the government], it is necessary to make changes to the constitution and then immediately start forming a new government on the basis of those changes."
Meanwhile, EU foreign policy chief Javier Solana was due to join the Polish and Lithuanian presidents and a Russian envoy in Kyiv today for further mediation efforts.
(Reuters/AP/AFP)[To see an archive of RFE/RL's full coverage and analysis since the Ukrainian crisis began, click here.]