An upsurge in new coronavirus variants and poor access to vaccines in developing countries threaten the global economic recovery, finance ministers of the world's 20 largest economies warned.

The G20 gathering in the Italian city of Venice was the ministers' first face-to-face meeting since the start of the pandemic, Reuters reported.

A final communique said the global economic outlook had improved since G20 talks in April thanks to the rollout of vaccines and economic support packages, but acknowledged its fragility in the face of variants like the fast spreading Delta.

“The recovery is characterised by great divergences across and within countries and remains exposed to downside risks, in particular the spread of new variants of the Covid-19 virus and different paces of vaccination,” it read.