China sent three astronauts to its permanently inhabited space station on Thursday, in its 15th crewed spaceflight and the 20th overall in the Shenzhou program that started over three decades ago.

China has launched three astronauts to replace the crew on the Chinese Tiangong space station. The Shenzhou 20 spaceship took off as planned atop China’s workhorse Long March 2F rocket at 5:17 p.m. local time (0917 GMT).

A Pakistani astronaut will become the first foreign national aboard China’s Tiangong space station, as Beijing steps up space diplomacy amid a burgeoning battle with the United States for supremacy in orbit.