Furthermore, beyond the mentioned examples, cyber activities targeting elections may be
comparable in scale and effect to coercion if they aim at and result in a substantive
disturbance or even permanent change of the political system of the targeted State, i.e.
by significantly eroding public trust in a State’s political organs and processes, by seriously
impeding important State organs in the fulfilment of their functions or by dissuading
significant groups of citizens from voting, thereby undermining the meaningfulness of an
election. Due to the complexity and singularity of such scenarios, it is difficult to formulate
abstract criteria. Discussions in this context are still ongoing.
c) Prohibition of the use of force
So far, the vast majority of malicious cyber operations fall outside the scope of ‘force’.
However, cyber operations might in extremis fall within the scope of the prohibition of
the use of force and thus constitute a breach of art. 2 para. 4 UN Charter.
The ICJ has stated in its Nuclear Weapons opinion that Charter provisions ‘apply to any use
of force, regardless of the weapons employed.’26 Germany shares the view that with regard to
the definition of ‘use of force’, emphasis needs to be put on the effects rather than on the
means used.
Cyber operations can cross the threshold into use of force and cause significant damage in
two ways. Firstly, they can be part of a wider kinetic attack. In such cases they are one
component of a wider operation clearly involving the use of physical force, and can be
assessed within the examination of the wider incident. Secondly, outside the wider context
of a kinetic military operation, cyber operations can by themselves cause serious harm and
may result in massive casualties.
With regard to the latter case, Germany shares the view expressed in the Tallinn Manual 2.0:
the threshold of use of force in cyber operations is defined, in analogy to the ICJ’s Nicaragua
judgement,27 by the scale and effects of such a cyber operation.28 Whenever scale and
effects of a cyber operation are comparable to those of a traditional kinetic use of force, it
would constitute a breach of art. 2 para. 4 UN Charter.
The determination of a cyber operation as having crossed the threshold of a prohibited use
of force is a decision to be taken on a case-by-case basis. Based on the assessment of the
scale and effects of the operation, the broader context of the situation and the significance
of the malicious cyber operation will have to be taken into account. Qualitative criteria which
may play a role in the assessment are, inter alia, the severity of the interference, the
immediacy of its effects, the degree of intrusion into a foreign cyber infrastructure and the
degree of organization and coordination of the malicious cyber operation.
26
27
28
International Court of Justice (ICJ), Legality of the Threat or Use of Nuclear Weapons, Advisory Opinion of 8 July
1996, I.C.J. Reports 1996, 226, para. 39.
ICJ, Military and Paramilitary Activities in and against Nicaragua (note 21), para. 195.
Tallinn Manual 2.0 (note 4), rules 69, 71.
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