Independent observers monitoring webstreams of Russia's presidential election polling stations on Sunday (March 18) cried foul, sharing video links on social media alleging violations across the country.
Clips taken from official live internet transmissions of voting provided by Russian telecoms operator Rostelecom, were uploaded to social media sites claiming to show instances of ballot stuffing.
Ella Pamfilova, head of the commission organising the vote nationwide, has said any fraud will be stamped out.
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She said those already alleging the election was rigged were biased and peddling "Russophobia", echoing a line used by the Kremlin to describe Western criticism of Russia.
The presidential election is set to give Vladimir Putin a runaway victory, the only possible blemish for the Kremlin being if large numbers of voters do not bother taking part because the result is so predictable.
Opinion polls give Putin, the incumbent, support of around 70 percent, or nearly 10 times the backing of his nearest challenger. Another term will take him to nearly a quarter century in power - a longevity among Kremlin leaders second only to Soviet dictator Josef Stalin.