Abstract
Abstract Since the invasion of Ukraine by Russia on 24 February 2022, Western states have provided significant military support to the Ukrainian armed forces, through the supply of arms or intelligence. This article enquires whether those states need any legal justification to make such support lawful under international law and, more particularly, under the law on the use of force, the law of neutrality and the regulation of arms transfers. It concludes that such justification might be required in certain circumstances and that the supporting states’ narrative, namely helping Ukraine to exercise its right of self-defence in response to a blatant armed attack, might act as a valid justification, except with respect to certain regulations on arms transfer.
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