What would the UPF do if they found a sathar world?

Somehow I don't see a conventional invasion with hundreds of thousands of casualties being on the menu. And you have to wonder if they nuke the planet will the sathar return the favor on their next raid. Kinetic strikes are as good as a nuke and leave no radiation but do we really care if we irradiate a worm infested world? After all habitable worlds seem to be a dime a dozen. Would a scorched earth / shiva option be effective or will it open a can of worms.