Listening to it this way does make it sound simple, but resolving a matter that originally lacked any leads, something originally extraordinarily complex, with such a straightforward approach is no simple task.
In other words, being able to handle something exceedingly difficult with a very simple solution is, in itself, quite challenging.
Moreover, the person possessing such ability is by no means ordinary.
Here's another issue: Gao Yi discovered that Yuri had a deep understanding of KGB personnel and relationships. He didn't behave as though he'd been locked in prison long enough to lose contact with the outside world. In other words, it's possible that he merely has nowhere to go, rather than being prevented from leaving.
If that's the case, doesn't it mean Yuri could really be persuaded to defect?
"It sounds simple, but when it comes to actually doing it, it might be incredibly difficult."