Some uninformed guesses:
No, not Russians or Chinese. Or aliens. Or a dark government conspiracy, nor Greenpeace-style activists, nor anti-drone false-flag operation. Not terrorism.
The airport shutdown is not accomplishing any clear strategic goal, it seems to me. It's harassment.
IMHO and uninformed guess: it sounds to me more akin to arson or vandalism. The motive may be power-tripping (look how smart and powerful I am!) or perhaps disgruntled-employee revenge.
Quite nasty wake-up on the topic, though, and very likely to encourage copy-cat acts.