Leaders of the major industrial nations have pledged one billion Covid vaccine doses to poor countries as a "big step towards vaccinating the world", Boris Johnson has said.
At the end of the G7 summit in Cornwall, the PM said countries were rejecting "nationalistic approaches".
He said vaccinating the world would show the benefits of the G7's democratic values.
There was also a pledge to wipe out their contribution to climate change.After the first meeting of world leaders in two years, Mr Johnson said "the world was looking to us to reject some of the selfish, nationalistic approaches that marred the initial global response to the pandemic and to channel all our diplomatic, economic and scientific might to defeating Covid for good".
He said the G7 leaders had pledged to supply the vaccines to poor countries either directly or through the World Health Organization's Covax scheme - including 100 million from the UK.
The communique issued by the summit pledges to "end the pandemic and prepare for the future by driving an intensified international effort, starting immediately, to vaccinate the world by getting as many safe vaccines to as many people as possible as fast as possible".
It also includes steps to tackle climate change, with leaders re-committing to the target of reaching net zero greenhouse gas emissions by 2050 at the latest and pledging to eliminate most coal power.
What difference could G7 vaccine donations make?
In Pictures: World leaders bask in Cornwall sun at G7 summit
How significant are G7's climate pledges?
Has this been a G7 summit that mattered?
Mr Johnson rejected suggestions the vaccines pledge was a moral failure by the G7 as it was not enough to cover the needs of poorer countries.
He referred to the the UK's involvement in the development of the Oxford-AstraZeneca vaccine.
"Already of the 1.5 billion vaccines that have been distributed around the world, I think that people in this country should be very proud that half a billion of them are as a result of the actions taken by the UK government in doing that deal with the Oxford scientists and AstraZeneca to distribute it at cost," he said.
He added that "we are going flat out and we are producing vaccines as fast as we can, and distributing them as fast as we can".
The target to vaccinate the world by the end of next year would be met "very largely thanks to the efforts of the countries who have come here today", Mr Johnson said.
The leaders slightly exceeded their target of donating a billion Covid vaccines to poorer countries within the next year, if funding for future doses is included alongside individual jabs.
There was also a commitment to build the frameworks to prevent and fight future pandemics. Elsewhere in the 25-page communique, there were several references to China, which President Biden said was a change from previous meetings of the world's advanced economies.
Pledges made this time included working together to respond to China's impact on world trade.
On the recovery from Covid there was even a reference to Prime Minister Boris Johnson's trademark domestic policy - the need to reduce inequalities by "levelling up".
Charities and campaigners issued statements calling out vague promises and missed opportunities, but Mr Johnson will feel that post-Brexit Britain has staged a diplomatic show that was both competent and confident.