“‘Shattered’: Inside the Secret Battle to save America’s Undercover Spies in the Digital Age”, 2019-12-30 (; backlinks; similar):
[Wide-ranging review of how social media, government database hacks, personal genomics, open-source intelligence, and pervasive surveillance are destroying traditional espionage, as undercover agents are unable to enter countries or recruit sources without being instantly exposed, forcing ever greater reliance on signals intelligence/hacking.
Failures in OPSEC have resulted in entire countries going dark and the exposure of multiple US espionage networks and execution of sources, as well as embarrassing many countries when organizations like Bellingcat are able to expose agents and operations.
While agencies like the FBI and CIA have begun adapting to the new reality, they have a long way to go, and countries like Russia or China or North Korea will only become harder to penetrate and obtain intelligence on.]