Ukrainian opposition leaders Vitali Klitschko, Oleh Tiahnybok and Arseniy Yatseniuk have arrived at the presidential administration building where they are expected to discuss the political crisis in Ukraine with the country's President Viktor Yanukovych.

"The key message is: terror, persecution of people must stop, and also the resignation of the government and (Interior Minister Vitaliy) Zakharchenko. These are our main demands," Klitschko told reporters upon arrival to Bankova Street.

The time of the meeting between the opposition leaders and the head of state was changed several times throughout Thursday.