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Political analyst Volodymyr Fesenko said Mr. Yanukovych’s party likely will retain control over parliament but will face a strengthened opposition.

“The Party of Region won by the number of points, but the opposition scored a moral victory,” Mr. Fesenko said. “The monopoly on power will be harder to maintain.”

The showing of the far-right Svoboda party, which had been expected to barely pass the 5 percent vote threshold, emerged as a big surprise.

Svoboda, which campaigns for the preservation of the Ukrainian language and culture and strongly attacks Mr. Yanukovych, is also known for xenophobic and anti-Semitic rhetoric. Analysts said the party’s popularity was due more to many Ukrainians’ anger with the ruling party than with vehemently nationalist views.