Lets take his job out of it- suppose it was all a lie, and he actually works as a cleaner? I cannot aee what law he wouod be breaking
Conspiracy requires intent, which has to be proven beyond reasonable doubt. Good luck convincing a jury that cleaner had intent to sell gov. secrets, and it wasnt a joke.
Fraud, entering into a contract without intent to fullfill it? I don't think it works if the obligations would be illegal