• Opinion polls give Putin, the incumbent, support of around 70 percent, or nearly 10 times the backing of his nearest challenger.

• Kremlin officials privately acknowledge a worry that some of Russia's 110 million eligible voters will not bother casting ballots because they believe Putin is a shoo-in. A low turnout could diminish his authority in his next term.

• To attract voters, officials delivered eggs, tinned peas, and frozen pike to polling stations in the Khabarovsk region, on Russia's Pacific coast, which will be sold to voters on polling day at a discount of between 10 and 30 percent compared to prices in local shops.

Russia began voting in a presidential election on Sunday, and are set to give Vladimir Putin a commanding victory that could only be blemished if large numbers do not bother taking part because the result is so predictable.

A day of voting across Russia's 11 time zones began at 2000 GMT on Saturday on Russia's eastern edge, in the Pacific coast city of Petropavlovsk-Kamchatsky. Voting will run until polls close at the westernmost point of Russia, the Kaliningrad region on the Baltic Sea, at 1800 GMT on Sunday.

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.

Putin's opponents alleged officials were trying to inflate the turnout.

Many voters credit Putin, a 65-year-old former KGB spy, with standing up for Russia's interests in a hostile outside world, even though the cost is confrontation with the West.

A row with United Kingdom over allegations the Kremlin used a nerve toxin to poison a Russian double agent in a sleepy English town — denied by Moscow — has not dented his standing.

The majority of voters see no viable alternative to Putin: He has total dominance of the political scene and the state-run television, where most people get their news, gives lavish coverage of Putin and little airtime to his rivals.

Galina Zhukova, a pensioner, came to polling station number 1512 in Zelenodolsk, about 800 km (500 miles) east of Moscow, with her husband, Alexei. They arrived soon after the doors opened.

"We voted for Putin. Things are all right for us," said Alexei. "And there's no one else to vote for," Galina said.

"He (Putin) is our president. We take pride in him," said Marianna Shanina, a resident of the Crimea region. Russia annexed Crimea from Ukraine four years ago, earning Putin admiration from many Russians and condemnation from the West.