Briefing reporters ahead of President Joe Biden's participation in the summit, the official said most nations in the group had come together during talks in recent days and agreed that Russia's war in Ukraine should be "condemned in the strongest possible terms."

Indonesian President Joko Widodo told G20 members to "end the war", in an apparent reference to Russia's invasion of Ukraine, as he opened a leaders' summit in Bali on Tuesday.

Crown Prince Muhammad Bin Salman is expected not to have a meeting with United States President Joe Biden at the G20 summit, US National Security Advisor Jake Sullivan said Sunday. 

Asia's longest-ruling leader said in a Facebook post that he got the positive result on arrival in Bali for a G20 summit, but was not experiencing any symptoms.

Sunak, who only took office three weeks ago, is due to hold formal bilateral meetings with US President Joe Biden and the leaders of Saudi Arabia, Japan and Australia. 

Ukrainian President Zelenskiy said he welcomed statements from the United States and China at meetings in Asia on the inadmissibility of threats to use nuclear weapons.

Leaders of the Group of 20 (G20) major economies open talks on Tuesday on the island of Bali, after a final pitch by host Indonesia for the bloc to focus on action to help a global economic recovery despite deep rifts due to the war in Ukraine.

"We are working very hard to ensure that we not only make clear, important statements on all the issues that affect the world together... but also on the issues of peace and the consequences of the Russian war of aggression on Ukraine," Scholz said during a joint news conference with Singapore's prime minister, Lee Hsien Loong, in Singapore.

The world's biggest rainforest nations Brazil, Indonesia and the Democratic Republic of Congo on Monday formally launched a climate partnership to work together on conservation.

British Prime Minister Rishi Sunak on Tuesday extended his support for Ukraine at the G20 summit and said that Russian President Vladimir Putin's regime will hear the chorus of global opposition to its actions.

President Jokowi and United States President Joe Biden agreed on Monday to deepen “concrete” Indo-Pacific cooperation as they unveiled a number of new US investment pledges in Indonesia.

Xi and Biden both sought to lower the temperature as they met for more than two hours on the resort island of Bali, with the presidents both saying they wanted to prevent high tensions from spilling over into conflict.

Fresh from securing a norm-breaking third term as Communist Party leader, Xi will have the wind at his back as he prepares to meet a string of powerful dignitaries in what is only his second overseas trip since early 2020.

He was taken to hospital for a "check-up" at the Sanglah hospital and he "immediately returned", said Bali Governor I Wayan Koster.

German Chancellor Olaf Scholz is expected to arrive in Bali on Monday evening for the summit of the G20 group of major economies after visiting Vietnam and Singapore in a mission to reinvigorate ties with the Indo-Pacific region.

Designed to be a replica of the Sheikh Zayed Grand Mosque in Abu Dhabi — the largest one in the country, Surakarta's new mosque, painted in white with gilt ornamentation, has four minarets and one main dome.

A joint study by Pertamina and Exxonmobil had found a potential carbon storage capacity of 1 billion tonnes in Pertamina's oil and gas fields, which could permanently store Indonesia's emissions for the next 16 years, Pertamina said in a separate statement on Sunday.

Bali’s Nusa Dua hotel enclave has been transformed into ground zero of Indonesia’s G20 presidency activities, with beefed-up security and a fleet of electric vehicles servicing thousands of participants.

The Kremlin said that Putin would not even address the summit by video link.

Biden and Chinese counterpart Xi Jinping are on Monday set to meet face-to-face for the first time since Biden took office, as bilateral relations languish at their worst in decades. Jake Sullivan, a national security adviser to Biden, told reporters the meeting could last "a couple of hours".

Developing nations must have access to credit for economic growth without becoming reliant on "exploitative" lenders, Sunak is expected to tell the summit, echoing past G7 criticism of China.

It would be the first G20 Summit since Russia invaded Ukraine in February. Moscow calls its actions in Ukraine a special operation.

In a series of meetings between ASEAN countries and their Indo-Pacific partners on Saturday, President Joko “Jokowi” Widodo continued to advocate for regional peace and stability.

Albanese, whose Labor government is keen to scrape the ice off of Canberra's frosty relationship with Beijing, spoke to Li at a gala dinner on Saturday night at the Association of Southeast Asian Nations summit in Phnom Penh.

Addressing the East Asia Summit in Cambodia, Biden said the United States would compete with China and speak out over its human rights record, but stressed the importance of peace in the Taiwan Strait and ensuring freedom of navigation in the South China Sea. 

The President expects more financial support at the launch of the multi-million dollar fund.

Biden met Southeast Asian leaders in Phnom Penh ahead of his encounter with his Chinese counterpart on Monday in Bali.