It is well known that any cybersecurity aware country... here I point to some papers/articles [1][2][3] just as a reference of the modus operandi, not to isolate a particular country.

[1] https://arxiv.org/pdf/1507.07109

[2] https://osf.io/preprints/socarxiv/gf7jb/download

[3] https://www.foi.se/download/18.6b6fc4521690ffa2022169/155076...