I was taking a shower when this hit me:

The emergence of drones/remote-driven vehicles effectively bypass conventional nuclear deterrents. Say I'm the US, and I want to hit Russia before they could hit back. What do I do? Build self-driven SUVs with Russian license plates, darken the windows, and fit the biggest nuclear warhead in the back that is practically possible. Maybe put a dummy in the driver's seat so it's not that apparent that my car is remote-driven. Drive up to a big city/nuclear launch site, and boom.
I don't even know how could a nation protect itself from something like that.

Thoughts on this?