nuke mars?

[EEVblog]

Disarmed means a military technician needs to do something physically to turn it on. You would need to send an astronaut along with it to insert a core for it to be considered disarmed.

Not so. There are a few reliable methods to remotely "activate" a bomb that don't require a human.
One method used in real weapons is a neutron-absorbing chain or wire that is would out of the core by a motor that is remote triggered. Once the chain/wire is removed the core is "armed". The bomb can't go critical with the neutron absorber in place.

thats like putting a interlock that can be remotely triggered.

I would argue that you need a telepresence with a skilled human operator using a finicky robotic arm, that is all just adding 1's and 0's to stuff, as soon as you put a motor to unscrew the thing poisoning the core, IMO its armed because a malfunction can arm it. But even that is not kosher..

This exact technique has been used on active nuclear weapons in the US arsenal.