By Sikhosonke Mayekiso

States bear considerable latitude when external measures encroach on essential interests. One can acknowledge that when states respond by imposing reciprocal economic measures, they directly engage with erga omnes principles. These responses redefine the scope of collective obligations in favour of sovereign autonomy, The latter receives firm standing as we note the patterns that have emerged over the past decades, showing sanctioned states moving beyond passive compliance toward direct and structured counter responses.

A recurring trend is the use of reciprocal economic measures. States facing export controls, financial restrictions or commodity embargoes often introduce corresponding limits on the sanctioning economies. By way of example, Russia’s restrictions on energy exports to Europe post 2022 could be considerably framed as legitimate exercise of security exceptions. The countermeasures clearly signal that unilateral pressure invites symmetrical consequences.

It has also been observed that states often pursue self-reliance in response to sanctions. Russia expanded import substitution programs across electronics, agriculture and pharmaceuticals after the initial wave of Western measures. Iran developed alternative shipping networks and local refining capabilities to sustain oil revenues despite maritime restrictions. North Korea has pursued long-term programs to reduce dependence on external supply lines. These internal adaptations by no means eliminate effects of sanctions, but they significantly diminish long-term vulnerability. They reasonably transform external constraint into a driver for structural change within the economy.

Reciprocal measures and self-reliance do not deny collective duties outright; they reinterpret their practical reach. When a state responds to perceived encroachments by mirroring economic pressure or by building internal alternatives, it effectively argues that erga omnes obligations must respect sovereign boundaries. If sanctions are intended to enforce a fundamental norm such as the prohibition of aggression, the counter-response implies that the enforcement itself may be selective or disproportionate. This creates a cycle in which the collective character of the duty is gradually relativised. The responding state maintains that sovereignty, protected under Article 2(7) of the Charter of the United Nations, limiting the permissible scope of interference even when the underlying violation is serious. Nevertheless, Article 2(7) stipulates that this non-intervention principle shall not prejudice the application of enforcement measures under Chapter VII. In practice, Chapter VII has been invoked in discussions of state countermeasures against sanctions violations, particularly where they intersect with erga omnes obligations owed to the international community as a whole.

The current pattern of responses is no longer merely a set of isolated countermeasures; it constitutes a cross-regional challenge to the way erga omnes obligations are enforced in practice. When states consistently respond with reciprocal measures that impose symmetrical costs and with internal adaptations that blunt long-term isolation, the character of these duties begins to weaken. The international legal order then moves toward a situation in which fundamental norms remain formally binding but their practical weight depends increasingly on the willingness and capacity of targeted states to resist rather than on the universal conviction that they must be upheld.

The takeaway is therefore twofold. First, these countermeasures evince that erga omnes duties, although sturdy, face practical erosion when states develop structured ways to absorb and redirect external pressure. Second, the persistence of reciprocity and self-reliance serves as a solemn reminder that collective norms require broad legitimacy if they ought to retain force. In the absence of proportionality and good faith in enforcement, we risk the decay of the duties imposed by erga omnes.

It is worth advancing that a balance must be struck. Erga omnes obligations are not intended to override sovereignty in an absolute sense; they are meant to operate within a system that also protects domestic jurisdiction. The UN Charter itself makes it plain, while Chapter VII provides for collective enforcement when the threat is grave enough to warrant Security Council action. The difficulty arises when unilateral or coalition-based sanctions, even if motivated by erga omnes concerns, are perceived as bypassing that pathway or applying inconsistent standards. When this perception takes hold, the responding state can credibly claim that the measure has lost its collective character and become a matter of power politics.

A proper balance therefore demands that the invocation of erga omnes duties be accompanied by three elements: first, a clear demonstration that the violation in question genuinely affects the international community as a whole; second, adherence to proportionality and good faith so that the response does not exceed what is required to address the breach; and third, preference for multilateral mechanisms whether through the Security Council or judicial review over unilateral or selective action whenever possible. Absent these elements, the cycle of resistance will continue and the normative force of erga omnes principles will be progressively undermine

The examples of reciprocity and self-reliance are not aberrations; they are symptoms of a deeper tension that law must address if it is to preserve the idea that certain norms truly bind all states equally. The balance between collective duty and sovereign prerogative is not unattainable, but it requires deliberate effort to maintain.

Disclaimer: This post reflects my personal views only and is not legal advice. Consult a qualified professional for your specific legal and related queries.