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San Remo Manual on International Law Applicable to Armed Conflicts at Sea, 12 June 1994
ARMED CONFLICTS IN WHICH THE SECURITY COUNCIL HAS TAKEN ACTION
SECTION III : ARMED CONFLICTS IN WHICH THE SECURITY COUNCIL HAS TAKEN ACTION
7. Notwithstanding any rule in this document or elsewhere on the law of neutrality, where the Security Council, acting in accordance with its powers under Chapter VII of the Charter of the United Nations, has identified one or more of the parties to an armed conflict as responsible for resorting to force in violation of international law, neutral States:
(a) are bound not to lend assistance other than humanitarian assistance to that State;
(b) may lend assistance to any State which has been the victim of a breach of the peace or an act of
aggression by that State.
8. Where, in the course of an international armed conflict, the Security Council has taken preventive or enforcement action involving the application of economic measures under Chapter VII of the Charter, Member States of the United Nations may not rely upon the law of neutrality to justify conduct which would be incompatible with their obligations under the Charter or under decisions of the Security Council.
9. Subject to paragraph 7, where the Security Council has taken a decision to use force, or to authorize the use of force by a particular State or States, the rules set out in this document and any other rules of international humanitarian law applicable to armed conflicts at sea shall apply to all parties to any such conflict which may ensue.