By Jack Mendel One of Russia’s top food retailers has cancelled its London listing, more than two years after Moscow’s war in Ukraine led to an exodus of firms from the UK. O’Key group pulled out of London this morning, after notifying markets about its intention to do so last month. The company said it continues to have listings on the Moscow Exchange and Astana International Exchange, in Kazakhstan. The firm is one of Russia’s leading food retailers, operating markets under the O`Key brand and discounters under the DA! brand. According to a statement to the London Stock Exchange this morning…