Marks & Spencer (M&S) is reportedly planning to open 250 more stores overseas over the next three years.Chief Executive Marc Bolland, who spoke to City analysts in Paris on Tuesday, said that the move would grow the High Street retailer's international sales by 25% and profits by as much as 40%."We need to build a brand internationally and be dot-com ready. That's where our future is," he said.M&S is looking to use Paris as a stepping stone for its international expansion and plans to open 20 new food-only stores in the French capital.The roll-out, which comes amid shrinking sales in its domestic UK market, will also expand to key markets in Western Europe, Middle East and India.Since Bolland became chief in 2010, M&S's store portfolio has increased from 337 stores in 41 territories to 455 in 53.BC