World leaders from the Group of Seven industrialised nations are meeting in England for a summit that is overshadowed by COVID-19, with proceedings beginning with discussions on recovering from the pandemic.
On the first day, leaders will also focus on questions such as COVID-19 vaccine donations and financial aid to build vaccine production sites around the world.
The G7 group has pledged to donate one billion vaccine doses to poorer nations, by sharing jabs directly and through financial aid, the British government announced.
Leaders are also to come up with a plan to extend vaccine manufacturing.
Before the summit, President Joe Biden said the US would donate another 500 million vaccine doses to 92 poorer countries and the African Union by June next year.
UK Prime Minister Boris Johnson, who is hosting the three-day summit in the coastal village of Carbis Bay, announced his country would provide 100 million surplus doses, most of them to be distributed through the COVAX vaccine-sharing program.
COVAX co-chair Jane Halton told Times Radio she was "delighted and excited" about Johnson's announcement.
"We've been calling to target the vulnerable around the world. So let's assume we get to one billion by the end, that will be extraordinarily welcome."
However, about 11 billion to 12 billion vaccine doses were necessary to immunise the entire global population, Halton warned, adding that so far only about 2.2 billion doses had been administered, about 77 per cent of which had gone to just 10 countries.
"And I don't think you have to be very creative to figure out that those are the wealthiest in the world," the COVAX chair said.
World Health Organisation spokesperson Margaret Harris also praised the G7 pledge. It was "very heartening to see" that countries with access to large numbers of doses have now "responded to our call to please share doses".
The G7 group remains divided over the issue of lifting patent protection for coronavirus vaccines, as proposed by the US and several other nations.
French President Emmanuel Macron said on Thursday that France and South Africa would present a proposal during the summit on an exemption for a limited period of time and applying to particular places.
The group is also looking to discuss plans to better prepare the world for future outbreaks. "Global solutions are needed," according to a draft of a "Carbis Bay Health Declaration" seen by DPA.
In the draft, the G7 leaders commit "to strengthen our collective defences to better prevent, detect and respond to, and recover from, future pandemics through effective multilateral action and a strengthened global health system".
On Friday evening, the leaders will attend a reception hosted by the Queen and Prince Charles, during which environmental protection and fighting climate change are on the agenda.
A group of 457 global investors published a letter on Friday, calling on leaders worldwide to ramp up national plans to combat climate change to meet the goals set in the Paris climate agreement.
It is the leaders' first in-person meeting in this format in two years, after the G7 leaders only met virtually last year due to the pandemic.
It is the first major international summit for Biden, which he is attending as part of a one-week Europe trip.
The group is also discuss relationships with Russia and China, with Biden looking to strengthen ties with the other G7 members again to create a united counterweight to the two nations.
The G7 comprises the United States, Britain, Germany, France, Italy, Japan and Canada. On Saturday, the leaders of Australia, India, South Korea and South Africa are invited as guests as well.
Johnson has said he hopes this will make the summit more of a conference of leading democracies.
Australian Associated Press