Taking a step further, any nation could deliberately send a weaponized fleet to destroy satellites and then follow up with a ground strike.

Kessler syndrome itself could probably be weaponized as the cheapest superweapon ever. Say you rule over a small country, under risk of invasion by a much more powerful country, that relies heavily on GPS guided missiles, aircraft and ammunition. Probably it would not be very expensive to pick a couple fat satellites at the right orbital plane, blow them with small missiles able to reach orbital altitude, and let the resulting debris scattershot start a chain reaction to take down every GPS satellite in existence, rendering low to medium Earth orbit useless for centuries as a byproduct. Those smart ammunitions would be crippled overnight, forcing the more powerful country to risk old style boots-in-the-ground invasion, with much degraded technical support.

Antisat weapons aren't exactly simple, either, though. It's only been successfully done a few times. Intercepting something at orbital velocity isn't trivial (unless you have the capability to actually launch something into a similar orbit and effect a gradual orbital rendezvous.)

I checked, my reasoning doesn't really apply to global positioning satellites, as they have orbits far outside the LEO, about 20000 km. There's not enough mass there yet to ensure a Kessler cascade. They would have to be targeted individually, a far more difficult task.

If only there was some sort of United Nation organization that wasn’t constantly undermined and turned into theater…

There is so much military hardware up there, military hardware disguised as civilian, satellites that were launched successfully but publicly described as a failure/"useless orbit".

The article is essentially asking that all countries need to share the location of their nuclear subs because the Ocean is getting crowded.