Biden, Xi meet ahead of G20 summit

Chinese leader Xi Jinping and US President Joe Biden have met for long-awaited talks that come as relations between their countries are at their lowest in decades, marred by disagreements over a host of issues from Taiwan to trade.

The two, holding their first in-person talks since Biden became president, met on the Indonesian island of Bali ahead of a G20 summit on Tuesday that is set to be fraught with tension over Russia's invasion of Ukraine.

They smiled as they shook hands warmly in front of a row of Chinese and US flags on Monday in a ballroom at the luxury hotel Mulia on Bali's Nusa Dua bay.

"It's just great to see you," Biden told Xi as he put an arm around him, adding in remarks delivered in front of reporters that he was committed to keeping lines of communication open on a personal and government level.

"As the leaders of our two nations, we share responsibility, in my view, to show that China and the United States can manage our differences, prevent competition from ... turning into conflict, and to find ways to work together on urgent global issues that require our mutual co-operation."

He mentioned climate change and food insecurity as problems the world expected their two countries to address.

Responding to Biden, Xi said the relationship between their two countries was not meeting global expectations.

"So we need to chart the right course for the China-US relationship. We need to find the right direction for the bilateral relationship going forward and elevate the relationship," Xi said.

"The world expects that China and the United States will properly handle the relationship," he said, adding he looked forward to working with Biden to bring the relationship back on the right track.

Their main topics of discussion were expected to be Taiwan, Ukraine and North Korea's nuclear ambitions, issues that will also loom over the G20 that is being held without Russian President Vladimir Putin in attendance.

Russian Foreign Minister Sergei Lavrov will represent Putin at the G20 summit - the first since Russia invaded Ukraine in February - after the Kremlin said Putin was too busy to attend. Russia's foreign ministry said a report that Lavrov was taken to hospital after arriving in Bali was fake news.

On Sunday, Biden told Asian leaders in Cambodia that US communication lines with China would stay open to prevent conflict, with tough talks almost certain in the days ahead.

Relations have been roiled in recent years by growing tensions over issues ranging from Hong Kong and Taiwan to the South China Sea, trade practices and US restrictions on Chinese technology.

But US officials said there have been quiet efforts by both Beijing and Washington during the past two months to repair ties.

Biden and Xi, who have held five phone or video calls since Biden became president in January 2021, last met in person during the Obama administration when Biden was vice-president.

G20 summit host President Joko Widodo of Indonesia said he hoped the gathering on Tuesday could "deliver concrete partnerships that can help the world in its economic recovery".

However, one of the main topics at the G20 will be Russia's war in Ukraine and Biden will be "unapologetic" in his defence of the European nation, US officials said last week.

Xi and Putin have grown increasingly close in recent years and reaffirmed their partnership just days before Russia invaded Ukraine. But China has been careful not to provide any direct material support that could trigger Western sanctions against it.

Chinese Premier Li Keqiang emphasised the "irresponsibility" of nuclear threats during the summit in Cambodia, suggesting China was uncomfortable with strategic partner Russia's nuclear rhetoric.

The West has accused Russia of making irresponsible statements on the possible use of nuclear weapons since its February invasion of Ukraine. Russia has in turn accused the West of "provocative" nuclear rhetoric.

Russia's Lavrov said on Sunday the West was "militarising" Southeast Asia in a bid to contain Russian and Chinese interests.

Ukrainian President Volodymyr Zelenskiy has said he would address the G20 by video link on Tuesday.