Bulgarias parliamentary election on Sunday is tipped to be a close race between the Socialists, seen as closer to Russia, and the centre-right.
A new grouping of nationalist "patriots" is forecast to come third.
Meet the main players as election draws nearer
If Bulgarian Socialist Party leader Kornelia Ninova can become premier it raises the prospect of NATO member Bulgaria drifting more towards Moscow
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Forming a government after the third election in four years in the European Union's poorest country will be tough. And the resulting coalition may be short-lived, experts say.
Here is a look at the main people to watch:
Left-wing live-wire
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Kornelia Ninova, 48, has injected fresh vigour into the Bulgarian Socialist Party (BSP), successor to the Communist Party, since becoming its first female leader last year.
Moscow and Sofia have deep cultural and economic ties and Ninova says she will veto a renewal of EU sanctions on Russia.
A recent cartoon depicted her on a Trojan Horse with Russian President Vladimir Putin inside.
Bulgaria's would-be first female prime minister, a former lawyer and business executive, has also criticised the EU, which Bulgaria joined a decade ago.
"We are the party that ushered Bulgaria into the European Union and NATO... But we do not want to be a second-class member," Ninova told AFP in a recent interview.
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Ninova enjoyed a major success in November when Rumen Radev, a former airforce commander backed by the BSP, was unexpectedly elected president.
Bounce-back Borisov
Burly former firefighter and bodyguard Boyko Borisov, 57, head of the centre-right GERB party, has been the towering figure in Bulgarian politics in recent years.
He has been premier twice but resigned both times, once in 2013 after nationwide protests against poverty and most recently in November after the presidential election.
Like most Bulgarians he also has a soft spot for Russia, giving Putin a puppy in 2010 and calling for "pragmatic" ties, but he toes the EU line on sanctions.
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And again like many compatriots, he is an enthusiastic European.
Borisov says he wants a third mandate "to guarantee stability". But although surveys suggest GERB may come first, analysts say voters may have had enough of him.
Turkish connection
Mustafa Karadaya, 46, heads the centrist Movement for Rights and Freedoms (MDL) representing mostly Bulgaria's 700,000-strong Turkish minority, a legacy of centuries of Ottoman rule.
The party, expected to garner between eight and 11 percent of the vote, has however become critical of Turkey and its President Recep Tayyip Erdogan.
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Karadayi says Erdogan has "abandoned" the values of Ataturk, modern Turkey's founder.
Last year a splinter group split off and formed a new party, Dost, which has openly backed Ankara -- angering Sofia.
Kingmaker 'patriots'
A new nationalist grouping, the United Patriots, has jumped on this to boost its support, while also railing against migrants, Muslims, Roma and gays.
Krasimir Karakachanov, 51, one of its three leaders, came third in the presidential election, and the United Patriots could repeat the feat on Sunday. It might then act as kingmaker in coalition talks.
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Karakachanov doesn't question Bulgaria's place in the EU and NATO. But he has called for sanctions on Moscow to be lifted.
Make Bulgaria great again
Another player in coalition discussions might be Veselin Mareshki, 49, a colourful populist who likes being called the Bulgarian Donald Trump, and his party Volya.
Like the US president, Mareshki is a businessman and political novice promising to drain the swamp of Bulgarian politics. He came fourth in the presidential race.
To demonstrate his prowess, his chain of petrol stations are currently selling fuel for 15 percent less than its competitors in order to show that the sector is a "cartel".
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