MOSCOW - President Vladimir Putin's party scored a landslide win in Russia's election, results showed on Monday, but the opposition vowed to challenge an outcome that could help Putin keep a grip on power after he leaves office.
In the first foreign reaction, the White House urged Russia to investigate opposition claims of widespread ballot-rigging in the vote which, according to incomplete official results, gave Putin's United Russia party more than 60 percent of the vote.
The Kremlin hailed the result as a signal from Russian voters that they want Putin -- required by the constitution to step down when his second term ends next year -- to retain influence even after he leaves office.
"Russian voters spoke in favour of United Russia, thus supporting President Putin's course, and spoke in favour of it being continued after the current president's second term ends," Dmitry Peskov, a Kremlin spokesman, told Reuters.
But the Communists, likely to be the only opposition force in parliament, said they would challenge the result in the Supreme Court. They said they would meet later on Monday to decide whether to boycott the new parliament.
Liberal Kremlin critic Boris Nemtsov of the SPS party called Sunday's vote "the most dishonest election in the history of modern Russia."
With 79.4 percent of votes counted, United Russia had 63.3 percent of the vote and the Communists 11.7 percent. Only two other parties -- Fair Russia and LDPR which both back the Kremlin -- cleared the 7-percent hurdle to qualify for seats.
The 55-year-old Putin, a former KGB spy who is hugely popular and credited by voters with restoring Russia's national pride, has been tipped for a role as prime minister or possibly speaker of parliament after his presidency.
Some observers say he could seek a third term as president, though he has said repeatedly he would not change the constitution to pave the way for this.
Allegations of ballot fraud are unlikely to strike a chord with the majority of Russians who, opinion polls show, respect Putin and want him to stay on as a "national leader." The opposition parties most critical of Putin have marginal support.
"I voted for United Russia because I believe that Putin can help us, simple working folk," said Sergei Ilin, 34, an unemployed man in the Siberian village of Belovsky.
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