While the meeting between Chinese President Xi Jinping and his U.S. counterpart Donald Trump on the sidelines of the G20 meet is expected to somewhat calm down tensions, Wang said any success in Buenos Aires would rest on a foundation of mutual respect.
The meeting could be a defining moment for the Group of 20, said Thomas Bernes of the Centre for International Governance Innovation, a Canada-based think tank focusing on global governance.
So far, the United States has imposed tariffs on $250 billion of Chinese imports - or about half the goods it imports from China each year - in response to Beijing's alleged theft of intellectual property and technology, as well as other trade complaints.
It is bin Salman's first significant appearance overseas since the killing.
Trump has often voiced a desire for better relations with Putin, and many critics at home slammed him in July for appearing to disregard USA intelligence agencies' conclusion that Moscow meddled in the 2016 United States presidential election, while giving credence to the Russian president's assertion that it did not.
US intelligence agencies have concluded that the 33-year-old crown prince ordered the killing of Jamal Khashoggi, a USA -based Washington Post columnist and critic of Saudi Arabia's establishment, at the Saudi Consulate in Istanbul on October 2.
Trump tweeted on Thursday that he was canceling the one-on-one with Putin because of Russia's seizure of Ukrainian vessels near the Crimean Peninsula, which Moscow annexed in 2014.
Security concerns also weighed on the two-day talks in Buenos Aires.
Mr Morrison also met with French President Emmanuel Macron to discuss the navy submarine contract, reforming the WTO and co-operation in the Indo-Pacific. "So there was no consensus reached on this issue, nor was there a joint declaration produced after the leaders' summit".
However, Trudeau took advantage of the signing ceremony to say the partners needed to keep working to lift tariffs on steel and aluminum.
British Prime Minister Theresa May is fighting for political survival as she tries to pull her country out of the European Union.
Merkel was supposed to get in to Buenos Aires early Friday, but her arrival was delayed after her plane suffered a technical problem and returned to Germany on Thursday night.
"We are not withdrawing our historic claim", he added. Labour's Tony Blair briefly visited Argentina in 2001. "The focus of this opportunity is in the reestablishment of trust".
Coming into this G-20, Trump faces a series of diplomatic challenges - most notably whether he can strike an agreement with Chinese President Xi Jinping (shee jihn-peeng) to ease trade tensions. "Several marched topless with colorful national flags of summit countries painted on their chests".
As the leaders arrived, Argentine security forces began locking down the central business district in Buenos Aires on Thursday.
Protesters have vowed mass rallies to harangue the world leaders gathering in crisis-hit Argentina, where recent violence between rival football fans raised questions about the police's ability to control unrest.
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