BEIJING, April 2 (Reuters) - Negotiations between Afghanistan and Pakistan are advancing steadily, China said on Friday following reports that the South Asian neighbours were meeting there to try to end their worst conflict since ‌the Taliban returned to power in 2021.China, which shares a western border with both nations, has been trying to mediate between the allies turned foes, holding telephone calls with their foreign ministers and sending a special envoy on visits in March.