via Dan Goodin's superlative reportage at ArsTechnica, we learn of the action in Panmunjom was - colloquially - the tip of the iceberg...

"It would be highly unusual for any country to cease intelligence gathering operations in the midst of some of the most important talks in their history," Sergio Caltagirone, director of threat intelligence at security firm Dragos, told Ars. Previously, he was a senior threat intelligence analyst at the US National Security Agency. "In fact, we would expect espionage activity to grow during periods of negotiation." - via Dan Goodin reporting at ArsTechnica