If that means you need to at least be physically present then I'd say that's a lot of protection already. Means someone in a foreign country can't simply get lucky fuzzing.
Alternatively, small drones exist, and so do low power devices you could slingshot/shoot into a secure area and set to auto wipe after they've done their job. Maybe could even build it out of biodegradable material so it'll clean up in short time.
Alternatively, small drones exist, and so do low power devices you could slingshot/shoot into a secure area and set to auto wipe after they've done their job. Maybe could even build it out of biodegradable material so it'll clean up in short time.