Ukraine's parliament on Wednesday called presidential elections for October 25.
An overwhelming majority of lawmakers -- 401 out of a total of 450 -- voted in favor of the bill, when 226 votes were enough for it to pass through. Another bill, proposing a date of December 27,was only supported by a single deputy.
The pro-Western president Viktor Yushchenko, who swept to power after the 2004-2005 Orange Revolution, had argued for holding the elections in January next year.
Yushchenko's administration reacted angrily to the parliament's decision, saying that it would contest the date in Ukraine's constitutional court.
"The president will without doubt go to the constitutional court about this question," presidential aide Marina Stavnichuk said, according to the Interfax-Ukraine news agency.
The decision could also delay parliamentary elections that had been expected this year. According to the constitution, legislative elections cannot be held in a six month period before the end of the presidential mandate.