Watch (Artilects)

The Watch is a network of satellite-based artificial intellects that orbit many human-colonized worlds. They were created by the Artilects to protect civilian populations from the use of weapons of mass destruction, a task achieved by identifying threats such as military aerospace craft, artillery or large man-portable explosives that approach within 50 kilometers of a protected population and destroying them with satellite-based kinetic bombardment weapons.

The Watch aren't overly fond of air-based attacks, as they see it as a way that conflicts can escalate out of control.

Opposition
While the Watch satellites are a powerful deterrent, they are not invulnerable. All the major powers possess the capability to destroy Watch satellites, but they are typically left alone. The various military powers aren't very fond of The Watch, out of fear of initiating a second Artilect War.

References:
more concrete references as I can find them.