It's hard to think of analogies which reflect the danger, the reputational damage and the material gain of this kind of betrayal. Murder doesn't have the element of reputational damage and material gain.
I mean, you signed a contract with the U.S., you were vetted, they did background checks, you had history together and built a battleship together, then you sold the schematics of that battleship.
If we're using human analogies, this is like selling the diary, identity information and naked photos of your overaccomplished olympian niece... and providing some genetic material to clone her.
There's no way to entrap somebody with that kind of betrayal. Regardless of money, they should actively protect and defend her from this kind of abuse. Out of a sense of decency and loyalty, protecting it even with their own life.
But really, analogies suck.