Vice President Kamala Harris toured the Vandenberg Space Force Base in California on Monday ahead of a Democratic National Committee fundraiser. Harris, who chairs the National Space Council, pledged in a speech to Space Force soldiers that the U.S. will no longer conduct destructive tests of satellites, and she called on other nations to end their development of satellite-killing weapons.

Vice President Kamala Harris: “These weapons are intended to deny the United States our ability to use our space capabilities by disrupting, destroying our satellites, satellites which are critical to our national security.”

Last November, Russia tested an anti-satellite missile that created more than 1,600 pieces of orbital debris large enough to track, posing a risk to satellites and astronauts. The U.S. carried out a similar test in 2008. At the time, the U.S. test prompted protests from Russia, which had just proposed a treaty to ban space weapons.