This sounds more like a scene from Agent007 movie than real world events. I'm interested what techniques are used today, as we have so many advanced technological means..
The human element will always beat technology, cheaper simpler and more effective.
It's far simpler to just sent in some dude, who pretends to be a common burglar should get caught, instead of building super fancy nano-drones which could fail/crash, then serve as evidence and would be studied for their technology.
It's the same reason why social engineering is one of the most common attack vectors for high-profile breaches, some persuasiveness can go a long way.
That might work for stuff like industrial espionage, but when it comes down to embassies and diplomats, where there is awareness of social engineering, this is not that obvious.
And when someone would break into an embassy, nobody is going to believe he's just a common burglar.
What was that movie where the guy was given a remote controlled electronic beetle he flew into the house via a cell phone controller in order to ID a terrorist for the drone bombing?
