"The central election commission declares Victor Yanukovych elected as the president of Ukraine," chairman Volodymyr Shapoval announced to applause in the commissions meeting hall.

The final results do not differ from preliminary figures announced on Wednesday.

Yanukovych had 48.95 percent of the vote, compared to Prime Minister Yulia Tymoshenkos 45.47 percent, and 4.36 percent of ballots were cast "against all" in a sign of disillusionment five years after the Orange Revolution.

According to Ukrainian law the inauguration of a new president must be held within 30 days of the official announcement of results.

"We will name the date of inauguration not later than tomorrow in the evening," a close ally of Yanukovych, lawmaker Borys Kolesnikov, said on television on Sunday.

Meanwhile Tymoshenko insists she has not been defeated and hopes to contest the final results in the supreme administrative court.

"We are certainly going to contest. The statement of claim will be given. I think on Monday or on Tuesday," Volodymyr Pylypenko, Tymoshenkos representative at the election commission, was quoted as saying by the Interfax news agency.

Tymoshenkos lawyers have already prepared claims for lower administrative and appeal courts.

"In particular there are 43 cases in the Kiev court of appeals about the inaction of the central election commission in considering some complaints", Pylypenko added.