The first face-to-face Group of Seven summit since the start of the coronavirus pandemic kicked off on Friday in Cornwall, southwestern Britain.
The agenda for the three-day meeting includes China's growing global prominence, and climate change.
British Prime Minister Boris Johnson said, "I actually think this is a meeting that genuinely needs to happen. Because we need to make sure that we learned lessons from the pandemic, make sure that we don't repeat some of the errors we doubtless made in the last 18 months or so, and we need to make sure that we now allow our economies to recover."
The leaders are expected to agree to provide one billion COVID vaccine doses to the world. Johnson earlier pledged to help vaccinate the global population by the end of next year.
Japanese Prime Minister Suga Yoshihide said he will explain the anti-coronavirus measures being taken for the upcoming Tokyo Olympics and Paralympics to gain support from the rest of the G7.