Image copyright Getty Images

Russia is the bookies' favourite to win this year's Eurovision song contest, and one reason for this is that it has spared no expense to produce an expertly staged performance. Winning Eurovision seems to have become a national priority, but why?

Seven years ago, Swedish television executive Svante Stockselius was in Moscow, watching rehearsals for the Eurovision finals. It was the first and only time the contest had been held in Moscow, after Dima Bilan's victory with Believe at the 2008 contest in Belgrade.

"All of a sudden, the Russians they went crazy, and they said Mr Putin, our prime minister, has arrived," remembers Stockselius, who was then Eurovision's executive supervisor.

"It struck me how short he was, Mr Putin, but I also remember when shaking his hand it was a fist of iron, it was very, very strong, and he was also very curious about details."

But why would the Russian strongman himself take an interest in Eurovision?

Image copyright Alamy Image caption Putin attending a Eurovision rehearsal in 2009

"Because they said that the Eurovision Song Contest was an event of high importance for the country," Stockselius says.

"And also he wanted to make sure himself that this would be a show that would promote Russia, that would show Europe what we can do. And they put a lot of money into that show."

In 2013, the Kremlin's total seriousness about Eurovision was on display again.

As the votes came in, the singer representing Azerbaijan, Farid Mammadov, won a maximum 12 points from Russia. But when Azerbaijan came to vote for Russia's Dina Garipova, the result was a shocking "nul points".

Image copyright Getty Images Image caption Azerbaijan's Farid Mammadov was awarded 12 points by Russia. The favour was not returned

"Ten points were stolen from us, well not from us but from our participant," Russian Foreign Minister Sergey Lavrov complained three days later, after meeting his Azeri counterpart.

"This does not makes one happy. We will agree on a unified course of action so this outrageous action will not remain without an answer."

Media playback is unsupported on your device Media caption Sergei Lavrov said Russia should have been awarded ten points by Baku, not zero

What especially rankled with the minister was the fact that Russia had actually come second in Azerbaijan's popular vote.

It's not uncommon for national juries to take a different view of a song than the members of the public, or to be influenced by political considerations, according to Daniel Gould, a British teacher who gave up his job to bet professionally on Eurovision. These are the kinds of things he has to weigh up when trying to predict a winner.

Find out more

Image copyright Kieron Humphrey

Listen to the Swedish Ambassador's Guide to Eurovision, presented by Nicola Clase, Sweden's ambassador to the UK, on the BBC World Service. Click here for transmission times or to listen online:

But politically inspired booing is not normal at Eurovision, or at least it was not until the Russian annexation of Crimea in 2014.

That year the studio audience in Copenhagen, where the contest was being staged, showed its disapproval when the Tolmachevy Sisters walked on to sing.

"They booed out two 17-year-old girls," says Jon Ola Sand, a Norwegian TV executive who was in charge of the show.

Image caption The Tolmachevy Sisters - some sections of the audience booed the Russian artists

"I met them backstage, they were absolutely devastated. It's the worst thing I've seen. It was so mean to these young girls who had done nothing wrong."

So last year he made a special plea before the singing began.

"We talked to the audience. We said please, everyone is invited here to compete in a friendly battle. So please do not boo at the artists."

The audience ignored him. Russia got booed again. And it wasn't because the song was bad - it came second.

One of Vladimir Putin's declared ambitions in his 16 years as president and prime minister has been to restore the country's status in the world. The outcome of this has been seen on the battlefield and the sports field - including the most expensive Olympics ever (winter or summer) in Sochi in 2014. And it seems Russia is determined to chalk up a second win at Eurovision. It's a matter of pride, and after the last two years of booing, of hurt pride.

"They have hired every top Eurovision person in their particular field to work on the Russian entry - two composers, a Russian called Philip Kirkorov and a Greek called Dimitris Kontopoulos, who've both written many Eurovision songs before," says the Eurovision gambler Daniel Gould.

Image copyright Getty Images Image caption Russia's Dima Bilan does Russia proud

"They've got the vocal coach, a Cypriot called Alex Panayi, who has worked on numerous successful Eurovision entries. They've hired the best Swedish backing singers. So basically they've put everyone in place to try and win it this year."

The verdict of the BBC Eurovision Twitter account after Russian contestant Sergey Lazarev's successful semi-final performance on Tuesday was "Olympic staging" and "Everything but the kitchen sink".

Lazarev himself also drew an Olympic analogy, in an interview with the BBC's Steve Rosenberg.

"For Russia it's very serious and like the Olympic Games in music, really, really," he said. "Russian audiences love Eurovision. Every year ratings are very high."

Media playback is unsupported on your device Media caption Meet Russia's Sergey Lazarev, the bookies' favourite for Eurovision

Across Europe, there are differing levels of enthusiasm for Eurovision.

According to music producer Christer Bjorkman, a survey showed that Swedes rank their birthday as the most important day of the year, followed by Midsummer, and then Melodifestivalen - the contest to select Sweden's Eurovision entry. Christmas came fourth.

In the UK, on the other hand, Eurovision has come to be regarded as something of a joke, the commentary - by the late Terry Wogan until 2009, and afterwards by Graham Norton - heavy with irony and innuendo.

Russia, despite the moral outrage voiced by pundits on TV when Austrian drag queen Conchita Wurst won in 2014, definitely lies at the Swedish end of the scale.

Image copyright Getty Images Image caption There was outrage by some TV pundits when Conchita Wurst won

Dr Karen Fricker of Brock University in Canada, who studies the politics of Eurovision, says the UK's aloof attitude towards the contest mirrors its ambivalent relationship with Europe as a whole.

So why, in her view, is Russia so keen to win?

"You could make an argument to say that while there is a lot of antagonism between Russia and the rest of the world, a platform in order to show that Russia can do Europe even better than Europe - even though it doesn't even care about Europe - is itself a very strong gesture of political and cultural power."

Listen to the Swedish Ambassador's Guide to Eurovision, presented by Nicola Clase, Sweden's ambassador to the UK, on the BBC World Service. Click here for transmission times or to listen online.

Subscribe to the BBC News Magazine's email newsletter to get articles sent to your inbox.