Aerial combat AI drones is the next step.

Let them fight it out, then smoke the sponsor's capital from orbit.

Response should be the force of an angry god.

Got me thinking about anti-drone drones. And anti-optical-fiber drones.

Re: massive retaliation for a first-strike drone swarm from containers. You wouldn't want to nuke the wrong actor, so first step would be to figure out who was responsible, and you can be sure nobody would own up to it, knowing the many megatons waiting to respond.

Step 1, detection.
Step 2, the return of the punt gun.