Volkswagen Group is partnering with China's Ecarx to develop and sell 'smart cars' in Europe and the United States.China's advanced car software has put traditional automakers at a disadvantage in convincing Chinese buyers.Volkswagen and Ecarx are already working together in Brazil and India, and are looking to expand the partnership in Europe and the US.However, there is a potential problem as the US has proposed a ban on cars with digital links to China from 2027.