From the New York Times:

Ukrainian Prime Minister Yulia Tymoshenko declared on Saturday that she had proof of cheating in a February 7 presidential election by rival Viktor Yanukovich and she would challenge his election through the courts.

“I want to clearly state: Yanukovich is not our president. Whatever happens in future, he will never become the legitimately elected president of Ukraine,” she said in a televised broadcast to the nation.

At the same time she promised not to call people out in mass protests as she did when she successfully challenged his election in 2004 in the Orange Revolution. “I will not call another ‘Maidan’ (Independence Square demonstration) and will not allow public protests,” she said.

[New York Times]