Jensen Huang resigned as chief executive officer of chipmaker Nvidia following an affair with an alleged Chinese spy, boosting the odds of tighter US export controls against China days before the countries’ leaders are due to meet. Huang left the company he founded in 1993 with immediate effect, according to a statement on Thursday. Chief Financial Officer Colette Kress will act as interim chief executive while the board looks for a permanent replacement to head the world’s second-biggest...