With Argentina at the helm this year, the two-day global forum is set to focus on the future of work, infrastructure for development and a sustainable food future. -China trade dispute to the conflict over Ukraine.
Chinese President Xi Jinping rallied developing nation leaders in attendance on Friday to condemn protectionism and laud the global rules-based order ahead of his highly anticipated dinner with US President Donald Trump on Saturday night. "I think I understood you better in your language than I did on this, but that's OK", Trump told Macri and then dropped his earpiece on the floor.
Trump said there had been some positive signs. "We'll see what happens".
The presence of Crown Prince Mohammed bin Salman at the summit also raised an awkward dilemma for leaders, and Saudi Arabia's de facto leader cut a lonely figure standing at the edge of the G20 family photo on Friday.
Trade analysts and administration officials acknowledge it won't be easy. Washington accuses China of deploying predatory tactics in its tech drive, including stealing trade secrets and forcing American firms to hand over technology in exchange for access to the Chinese market. If he can't get a deal with Xi, he's poised to more than double most of those tariffs January 1.
"But in terms of doing a deal. that's entirely up to the president of the United States and the president of China".
In recent months, the world's two largest economies have impose punitive tariffs on billions of dollars of one another's goods.
Xi and leaders from the BRICS group of leading emerging economies - Brazil, Russia, India, China and South Africa - called in a statement on Friday for open worldwide trade and a strengthening of the World Trade Organization (WTO).
It's unlikely the two countries will reach a full-blown resolution in Buenos Aires; the issues that divide them are just too hard.More news: Box Office Report: Close to 100 cr in worldwide gross
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While Turkey hasn't explicitly named MBS, President Recep Tayyip Erdogan said the murder was ordered at the highest level of Saudi leadership, though not by King Salman bin Abdulaziz Al Saud. For example, a draft says 19 of the participants agree on the importance of upholding the Paris climate accord, but the US doesn't.
Trump's second foreign trip, in July 2017, became another key moment in the Mueller investigation as the President and his aides worked to craft a statement on behalf of his eldest son concerning the now-infamous meeting with a Russian lawyer at Trump Tower a year prior.
When he was elected in 2015, Mr Macri promised market-friendly reforms to get Argentina's isolated economy back on track.
Trump argues that the massive balance of trade in China's favour is not sustainable for the American economy.
One of the leaders Mr Putin was scheduled to have more formal bi-lateral talks with was German Chancellor Angela Merkel.
Last spring, it looked like Beijing and Washington might have found a peaceful resolution.
The two countries are also at odds militarily over China's extensive claims in the South China Sea and USA warship movements through the highly sensitive Taiwan Strait.
A major issue that is hanging over the summit is the continued trade war between the United States and China.
Although the new pact inherits key features from the old one, Trump has declared it a victory for the U.S. workers he claims were cheated by NAFTA and on Friday called it the most "modern and balanced agreement in history".