DAVID LAWDER and LEIGH THOMAS FINANCE chiefs of the G20 large economies have endorsed a landmark move to stop multinationals shifting profits to low-tax havens at talks where they will also warn that coronavirus variants threaten the global economic recovery. They also acknowledged the need to ensure fair access to vaccines in poorer countries. But a draft communique to be rubber-stamped at the meeting in the Italian city of Venice did not contain specific new proposals on how to do that. The tax deal was set to be the biggest fresh policy initiative emerging from their talks. It caps eight…