That's treason, so it's fair for me. Russians and Chinese probably shoot betraying spies after being debriefed and tortured. It's part of the equation, that's why they should ask for millions and millions, risk vs reward.

https://www.law.cornell.edu/uscode/text/18/2381 Whoever, owing allegiance to the United States, levies war against them or adheres to their enemies, giving them aid and comfort within the United States or elsewhere, is guilty of treason and shall suffer death, or shall be imprisoned not less than five years and fined...