The G20 leaders' photo. Photo: Alexander Nemenov/AFP/Getty Images

Many of the world's most prominent leaders gathered at the G20 summit in Buenos Aires on Friday, including President Trump, Russian President Vladimir Putin and Saudi Crown Prince Mohammed bin Salman (MBS) — whose interactions have remained firmly in the headlines over recent weeks.

Why it matters: The G20 comes amid multiple international controversies, including Trump's continued pledge to work with Saudi Arabia despite questions surrounding MBS' involvement in the murder of journalist Jamal Khashoggi as well as Trump's decision to cancel a one-on-one meeting with Putin citing ongoing conflict in Ukraine.

This friendly handshake between Putin and MBS rocked the Twittersphere:

Saudi Prince Mohammed bin Salman smiles at President Trump. Photo: Saul Loeb/AFP/Getty Images
French President Emmanuel Macron speaks with MBS. Photo: Bandar Al-Jaloud/AFP/Getty Images
Trump flanked by Macron and Japanese Prime Minister Shinzo Abe. Photo: Alexander Nemenov/AFP/Getty Images
MBS and Putin lining up for a group picture. Photo: Jaun Mabromata/AFP/Getty Images
Trump chats with British Prime Minister Theresa May. Photo: Alejandro Pagni/AFP/Getty Images

Go deeper: After meeting cancellations, more headaches await Trump at G20

Go deeper

Dion Rabouin, author of Markets
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Photo illustration: Aïda Amer/Axios. Photo: Win McNamee/Getty Images

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The big picture: A slew of media companies are endorsing a candidate this year for the first time ever, citing the unprecedented nature of this election.