Mr Sunak will set out his economic vision to fellow leaders (Image: Getty)Britain wants to ensure Russia ‘reckons with the devastation’ it is causing. It claims the world’s most powerful economies have a vital role to play in addressing the ‘desperate global economic situation’.Speaking ahead of his departure for the G20 today, Mr Sunak said: ‘Putin’s war has caused devastation around the world – destroying lives and plunging the international economy into turmoil.”‘This G20 Summit will not be business as usual. We will call out Putin’s regime, and lay bare their utter contempt for the kind of international cooperation and respect for sovereignty forums like the G20 represent.”‘In clear contrast to Putin’s disruption, the UK and our allies will work together to make meaningful progress solving the economic challenges we face and making lives better for our people.’A Government source said: “The G20 meeting in Indonesia takes place at a time when countries around the world are facing huge economic difficulties, caused or exacerbated by the illegal invasion of Ukraine. The way to alleviate these problems is for Putin to end this war.’The UK argues that the G20 was created to ‘deal with exactly this kind of global economic turmoil’. The summit takes place just days ahead of Thursday’s autumn statement, when Chancellor Jeremy Hunt will lay out his plan to restore financial stability.Mr Sunak will set out his economic vision to fellow leaders and seek to strengthen alliances.Britain has applied to join a trading bloc with 11 Pacific-facing countries, has worked with Japan on a new combat air system, and has struck the AUKUS defence pact with Australia and the United States.The source said: ‘At the G20, the Prime Minister will cement these relationships – meeting allies from all over the world to build the kinds of international partnerships and agree the cooperation that will be key for putting the UK, and the world, on a firm path towards economic growth and security.’