It is implicitly recognised in the system of Westphalian nation-states and expressly recognised by Article 51 of the Charter of the United Nations that all states have the inherent right to individual and collective self-defence when they are the subject of an armed attack. Article 51 of the UN Charter guarantees states the right to defend themselves until the Security Council takes steps to achieve peace. Beyond the natural propensity of a State to maintain certain norms, the strength of international law comes from the pressure exerted on each other by States to behave consistently and to respect their obligations. As in any legal system, many violations of international obligations are overlooked. .

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