How China and Russia recruit, reward and punish spies — and which one is a cheapskate

The arrest of Linda Sun, a Chinese spy who worked her way into an influential position in the office of Governor Kathy Hochul shows how easily devious and well-hidden threats from adversaries can be hiding in plain sight.

“New York City is alive with spies,” James Olson, former chief of counterintelligence at the Central Intelligence Agency and author of…