Russia is working on antisatellite weapon systems that would use nuclear explosions in orbit to destroy satellites in large numbers rather than conventional weapons that would attack satellites individually. A Wall Street Journal article centered on a Russian two-year-old launch of a satellite intended to conduct research into such a weapon had this, which is concerning for other reasons, also.

The eventual weapon, if and when deployed in orbit, could wipe out satellites in a part of space dominated by American government and commercial assets, they said, including SpaceX’s Starlink constellation….

An at least as large concern is that such a detonation or detonations would create EMP pulses that would be extremely damaging to our electric grid and the computer networks controlling that grid; to our oil, natural gas, and water distribution grids; and to the data centers handling our communications and financial systems.