With the health of the global economy less of a headache than in previous years, it is the war in Syria that will cast the longest shadow at the two-day Group of 20 summit in the Mediterranean resort of Antalya.
The glitzy five-star venue may seem far from the tragedy of the conflict that has left over a quarter of a million people dead, but the border with Turkey's conflict-torn neighbour is just 600 kilometres (370 miles) away.
The meeting is the biggest gathering of world leaders ever hosted by Turkey and gives President Recep Tayyip Erdogan the perfect opportunity to present himself as a key global player two weeks after his party regained its overall majority in a parliamentary election.
The G20 format provides a rare chance for US President Barack Obama, Chinese President Xi Jinping and Vladimir Putin of Russia to mix with the likes of Saudi King Salman and Indian Prime Minister Narendra Modi.
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But finding agreement on Syria will be tough, with Russia vehemently opposed to host Turkey's strategic aim of toppling President Bashar al-Assad and Ankara so far only receiving a lukewarm response to its plan of a safe zone inside Syria.
"A breakthrough is very unlikely on Syria or the refugee question," said Ozgur Unluhisarcikli, Ankara office director for the German Marshall Fund of the United States.
At the same time, he said the G20 would make a show of unity on the aim of bringing peace to Syria in the final communique. "They will want to end on a positive note, on a convergence of strategy."
The source said the refugee issue was expected to be raised specifically at the leaders' dinner on Sunday night.
Turkey, which is hosting 2.2 million refugees from Syria, wants a concrete financial aid package from Europe in return for stemming the flow of migrants setting out from its shores to Europe.