As world leaders flocked into the summit room to take their seats, Mohammad bin Salman and Russian President Vladimir Putin embraced each other with a friendly and enthusiastic high-five-shake and big smiles.

\"PHOTO:
G20 Argentina via AFP/Getty Images
PHOTO: Russia's President Vladimir Putin, center, and Saudi Arabia's Crown Prince Mohammed bin Salman greet each other at the G20 Leaders' Summit in Buenos Aires, Nov. 30, 2018, as President Donald Trump enter the room.
>

Bin Salman has been at the center of the international spotlight over whether he is responsible for Khashoggi's murder.

Russia, on the other hand, recently did not return Ukrainian ships and its crews that Russia seized near Crimea, causing Trump to cancel a highly anticipated meeting with Putin.

4.Trump leaves Macri

Argentinian President Mauricio Macri was left alone on stage during a photo opportunity as Trump left the stage. It is unclear whether it was a misunderstanding, but Macri is seen in a video calling Trump back.

\"PHOTO:
Ricardo Mazalan/AP
PHOTO: President Donald Trump walks away from Argentina's President Mauricio Macri, left, at the start of the G20 summit in Buenos Aires, Argentina, Nov. 30, 2018.
>

5. Trump’s earpiece drop

As Macri shared greeting remarks, Trump held his translation earpiece with his hands then soon took it off.

“I think I understood you better in your language than I did on this. But that's OK,” Trump said dropping his earpiece on the floor beside him.

\"PHOTO:
Saul Loeb/AFP/Getty Images
PHOTO: President Donald Trump puts down the translation device during his welcome by Argentina's President Mauricio Macri, right, at Casa Rosada presidential house in Buenos Aires, Argentina, Nov. 30, 2018, on the sidelines of the G20 Leaders' Summit.
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