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and tyson fury will take on dillian whyte later — in what's expected to be one of the biggest all—british heavyweight fights in boxing history. now on bbc news... talking business. hello, everyone, and welcome to talking business weekly, with me, aaron heslehurst. let's talk about what is on the show. it is the great business retreat, more than 750 companies exit russia in response to putin's war in ukraine. but many still remain. will those making the stand really make a difference or is it more symbolic? i am going to find outjust how important these foreign brands are to the r...

Is still operating in russia? to find out, i caught up with geoffrey sonnenfeld from yale university who has been compiling a list of some of the biggest household names, marking their action and inaction on leaving the russian market. geoffrey, a real pleasure having you on the show. thank you for your time. let's start with this. you and your team have been compiling this list of companies and their actions over the war in ukraine. just explain, how does it work? we have classified companies into five different categories. we are a school house at yale so of course we have letter grades as o...