What can be done to knock out their communications satellite or take out their home base on Earth?
Killer satellites are like maneuverable claymore mines with search and locate functions. They get it in proximity to the enemy satellite and give it a broadside blast. The shrapnel takes it out. The Soviets were rumored to have had them in the 1980's and even tested them. I feel sure our capabilities would be much better now. I also suspect there might be energy weapons available to reduce the space trash.