"15 years ago, #G20 leaders came together for the first time to restore global growth after the financial crisis," the UK PM tweeted.
"We meet at a time of enormous challenges – the world is looking to the G20 once again to provide leadership," he said.
He said: "Together I believe we can address these challenges."
The G20 Summit commenced in New Delhi on Saturday.
15 years ago, #G20 leaders came together for the first time to restore global growth after the financial crisis.
— Rishi Sunak (@RishiSunak) September 9, 2023
We meet at a time of enormous challenges – the world is looking to the G20 once again to provide leadership.
Together I believe we can address these challenges. pic.twitter.com/RFnry53YAf
With all the existing members' approval, Prime Minister Narendra Modi welcomed the 55-nation African Union to the G20, the members of which are here to attend this year's summit.
Modi, the G20 President for the year, announced the inclusion of the African Union during his inaugural address to the members.
Modi said, "Bharat's Presidency in G20 both inside and outside the country has become a symbol of inclusiveness. It has become the people's G20 in Bharat where crores of Bharatiyas are involved with the summit. There have been over 200 meetings in more than 60 cities.
"With the thought of inclusiveness, Bharat had proposed granting permanent membership to the African Union. I believe all of us (members of G20) are agreeing on it."