World leaders meet in Bali with a packed agenda of events, but Russia’s invasion of Ukraine threatens to overshadow the summit

• G20 explainer: everything you need to know about the summit
• See all our G20 coverage

Britain has announced it will spend $4.9bn on five new Navy ships to bolster security “in the face of increased Russian threats”.

The announcement came with prime minister Rishi Sunak set to begin his first full day of official events at the G20 summit in Bali.

Russia’s actions put all of us at risk. As we give the Ukrainian people the support they need, we are also harnessing the breadth and depth of UK expertise to protect ourselves and our allies. This includes building the next generation of British warships.

This week’s travel has brought together the broadest possible coalition of partners to confront this moment of great global challenges — from global inflation, to the climate crisis, to Russia’s brutal war against Ukraine.

At the G20 meetings, we’ll speak on the very issues that matter to people’s lives, not only at home but around the world. This forum is crucial for the world’s largest economies to work together for the good of people everywhere, and I’m looking forward to convening.”