That had led to greater confidence among some advisers that Saturday's dinner with Xi could produce a breakthrough, even though no official has been willing to explicitly say they expect the two men to come to an agreement. U.S. stocks closed slightly higher on Friday on market hopes that a compromise could be reached by the two leaders.
"The essence of the G20 is to foster dialogue while respecting differences, and we hope to lay the foundations for consensus for the next 10 years", Macri said.
European Council President Donald Tusk said the European Union would extend its economic sanctions on Moscow this month after Russian ships fired last week on Ukrainian vessels in the Sea of Azov, seizing the boats and sailors.
The leaders of the world's largest economies opened talks on Friday overshadowed by US President Donald Trump's threat to escalate tariffs on imports from China as well as military tensions between Russian Federation and Ukraine.
But Human Rights Watch accuses him of responsibility and also of war crimes in Yemen, and on Wednesday, Argentine legal authorities took initial action to consider a request to prosecute him for alleged crimes against humanity, a move apparently aimed at embarrassing him as he attends the summit.
One bright spot before the summit opened was the signing of a revised U.S. -Mexico-Canada trade pact to replace the North American Free Trade Agreement.
United States objections on climate and trade have seen two major summits this year, of the Group of Seven democracies and the Asia-Pacific Economic Cooperation forum, end without the once-routine statements.
Mr Trump has repeatedly accused the Chinese of stealing trade secrets and American intellectual property by compelling United States companies to hand over intellectual property in order to do business.
Fed officials express caution about pace of future hikes
Joblessness stood at 3.7% in October, well below the rate the Fed sees as sustainable in the longer run. His emphasis on Wednesday suggested greater flexibility to stop sooner or move more slowly.
Xi has in turn cast himself as a defender of stable global capitalism, a startling transformation for the leader of a communist state whose entry into the World Trade Organization less than two decades ago was controversial.
At the outset of his meeting with Japanese Prime Minister Shinzo Abe in Buenos Aires on Friday, Trump voiced optimism about the prospects of the planned U.S. The Kremlin said it was willing to be "patient" in arranging a meeting with Trump.
The Trump administration is understood to be preparing new restrictions on Chinese nationals applying for places at American universities as part of an effort to curb spying.
Meanwhile, French President Emmanuel Macron hinted that he would raise the issue of the murder of Saudi journalist Jamal Khashoggi when he meets Saudi Crown Prince Mohammed bin Salman, whom the Central Intelligence Agency reportedly concluded had ordered the killing.
He said the summit will also give Trump an opportunity to discuss trade with Chinese President Xi Jinping, and attempt to get some kind of deal to avoid a prolonged trade war. "That's all I said".
Saudi officials have blamed the killing on rogue agents and denied the crown prince had knowledge of the operation. However, it is being reported that Ms Merkel still plans to have her one-on-one with Mr Putin, with the pair set to meet on Saturday morning.
Laura Jaitman, the Argentine Treasury official shepherding the G-20's financing talks, said leaders have made progress on finance and trade and was hopeful a joint statement would be possible.
There are also questions about how to handle the awkward presence of Crown Prince Mohammed bin Salman.