How does China typically handle espionage cases involving Chinese nationals?

While China frequently publicizes cases of alleged foreign espionage, the domestic arrest of Chinese nationals on spying charges is actually quite rare. The recent case involving an ex-soldier arrested for leaking military secrets to a foreign agency represents an unusual public disclosure of internal espionage activities. This rarity highlights the sensitivity surrounding such cases and suggests China may be selectively publicizing this incident for specific strategic or deterrent purposes.