G20 leaders today opened annual talks rent by the deepest divisions since their first summit 10 years ago, as US President Donald Trump came under fire and Saudi Arabia's de facto ruler came in from the cold.
Trump was attacked by some for destroying the group's past unity on trade and climate change. But he won a breakthrough with the signing of a new trade pact for North America and, having ignited a trade war with China, touted "good signs" ahead of a dinner with President Xi Jinping.
The summit began in the capital with a traditional "family photo" by the leaders of a group whose relationships range from warm and friendly to chilly and distrustful.
Outside, as Argentina goes through a painful economic crisis, protesters gathered to denounce the government for spending freely on the summit while the public endures rocketing inflation and unemployment.
They paraded with signs attacking Trump and the International Monetary Fund (IMF), whose largesse is keeping Argentina afloat at the cost of hard-hitting austerity measures.
Russian President Vladimir Putin, under pressure himself after his security forces seized three Ukrainian ships, set the tone for a combative two days by condemning the "vicious" use of sanctions and trade protectionism.
The target was clear, as Trump – who cancelled a planned meeting with Putin in Buenos Aires – tears up the stability promoted by the G20 powers when they first convened in November 2008 in the grip of financial crisis.
Putin's attack, and similar criticism of Trump's isolationist stance by French President Emmanuel Macron, capped an incident-packed build-up to the G20 that included flare-ups over Ukraine and Saudi Arabia.
Rumours quickly spread however that Trump and Putin would hold an 'impromptu' meeting on the sidelines of the summit, a fact seemingly confirmed later by a post from a Russian government account on Twitter.
Putin grinned broadly and welcomed Saudi Crown Prince Mohammed bin Salman like a long-lost friend with an enthusiastic hand-shake after the group photo, where Trump looked on sombrely and Xi stood impassively.
The summit marks a quick return to the international stage for Prince Mohammed after the kingdom came under fire for the killing of journalist Jamal Khashoggi in its Istanbul consulate.
Macron and British Prime Minister Theresa May both said they were raising the killing of Khashoggi during meetings with the 33-year-old prince.
May told British media she intended to use the summit to sell the vision of a "global Britain" after its Brexit departure from the European Union, scheduled for March next year.
EU president Donald Tusk was more focused on the Ukraine crisis, saying at the G20 that he was "sure" the bloc would roll over its sanctions on Russia next month.
On the G20 front, Tusk admitted the world was undergoing a "difficult moment" overall, as Trump pursues a vision at odds with the idea of collective action on trade and climate change.
US objections on those fronts have seen two major summits this year, of the G7 democracies and the Asia-Pacific Economic Cooperation forum, end without the once-routine statements.
The same disputes were hobbling adoption of a G20 communiqué, observers said. One French source said Macron was trying to build an anti-Trump front with a separate statement embraced by "progressive countries."
Such a statement would endorse the Paris Agreement on climate change, the source said, after Trump yanked the United States out of the pact in the face of increasingly urgent warnings from scientists that action is needed now.
With a major UN meeting on climate change starting in Poland straight after the G20, UN chief Antônio Guterres said in Buenos Aires that "this is a make-it-or-break-it moment."
For Trump, there was no escape from the lengthening shadow of the US investigation over Russian meddling in his 2016 election, which is now reaching into his business affairs.
The US president began Friday with another Twitter blast defending his past property dealings in Russia, again denouncing the investigation as a "witch hunt," a day after his ex-lawyer pleaded guilty to lying to Congress over the affair.
On the G20 margins, Trump scored one victory for his "America First" agenda with the signing of a successor to the North American free trade pact NAFTA, the US-Mexico-Canada Agreement (USMCA).
Although the new pact inherits key features from the old one, Trump has declared it a victory for the US workers he claims were cheated by NAFTA and on Friday called it the most "modern and balanced agreement in history."
"This is a model agreement that changes the trade landscape forever," Trump said at the signing ceremony in Buenos Aires.
The G20 summit is the biggest international gathering in Argentina's history, and Friday's protest underlined security concerns after recent football violence forced the relocation of a showpiece final to Spain.
But the government is vowing zero tolerance of any unrest, and declared a public holiday, shuttering the metro system and keeping the normally choked roads largely free of traffic.
"The summit seems a nonsense to me," call-centre worker Agustina Vianello, 25, told AFP.
"We are in a bad situation, and we're putting a pile of money into this? Everything's high security. It's strange to see everything so empty," she said.