G20 leaders take group shot without Biden

US President Joe Biden, at his final summit as US president on Monday, headed for the group photo with fellow G20 leaders in Rio de Janeiro, only to find they had already taken the picture without him.

Biden missed out on the shot, along with the Canadian and Italian prime ministers in an incident blamed by frustrated US officials on "logistical issues".

It came during a South American tour during which Biden's counterparts have been looking past the outgoing US president in political terms — and towards his successor Donald Trump.

Biden's swan song on the world stage has seen the 81-year-old try to shore up his legacy before Trump potentially takes a wrecking ball to it with his isolationist "America First" foreign policy.

World leaders including Chinese President Xi Jinping, Indian Prime Minister Narendra Modi and French President Emmanuel Macron walked down a red-carpeted ramp at Rio's stunning Bayside Museum of modern art to the group photo set-up.

They took to a stage, chatted and joked as they gathered to pose against the backdrop of the Brazilian city's iconic Sugarloaf Mountain. The snap was over in a second.

Biden and Canadian Prime Minister Justin Trudeau then came in from another direction, after a bilateral meeting on the sidelines of the summit — but it was too late and the other leaders had already dispersed.

Italian Prime Minister Giorgia Meloni also missed the picture. She, Biden and Trudeau formed a separate huddle.

"Due to logistical issues, they took the photo early before all the leaders had arrived. So a number of the leaders weren't there," a US official said on condition of anonymity.

US officials denied that Biden missed the photo — officially for Brazilian President Luiz Inacio Lula da Silva's launch of an alliance to curb world hunger — to avoid appearing alongside Russia's Foreign Minister Sergei Lavrov.

Biden had earlier urged the G20 leaders to support Ukraine's "sovereignty" in the face of Russia's 2022 invasion.

Russian President Vladimir Putin was conspicuously absent from the Rio summit. His arrest is sought by the International Criminal Court over the Ukraine war.