KIEV: Ukraine has started a campaign for snap presidential elections on May 25, as the location of the country's fugitive president remains unknown.

The Ukrainian Central Election Commission posted an election calendar online early Tuesday, which gives candidates until April 4 to register for the race.

Russian state news agency RIA Novosti quoted the commission chief saying that he didn't foresee any legal obstacles for any of the candidates currently being discussed, including former Prime Minister Yulia Tymoshenko, a top political rival of President Viktor Yanukovych.

Tymoshenko was released from prison on Saturday.

Ukraine is being governed by an interim government led by parliament speaker Oleksandr Turchinov.

Authorities in Kiev have issued an arrest warrant for Yanukovych over the killing of 82 people, primarily demonstrators, in clashes between protesters and police.