On 26 March 2015, a Saudi-led coalition launched ‘Operation Decisive Storm’ on the territory of the Republic of Yemen following a request by that country's beleaguered government. Although it received no prior fiat from the UN Security Council and took place amidst a civil war, the intervention met with approval from numerous States, with only few critical sounds. Closer scrutiny nonetheless reveals that the self-defence justification, which is primarily relied upon, does not provide a convincing legal basis for the operation. Moreover, the intervention is problematical from the perspective of the intervention by invitation doctrine and undeniably exposes its indeterminacy and proneness to abuse.
