The Saudi-led military intervention into Yemen called 'Operation Decisive Storm' was announced on 26 March 2015 (renamed to 'Operation Restoring Hope' in April 2015). It came after a tumultuous period in Yemen following widespread protest in 2011/2012 that succeeded in forcing the long-time president Ali Abdullah Saleh to hand over the presidency to his vice president, Abdrabbuh Mansur Hadi. The subsequent transition process was initially accentuated by the United Nations (UN) as a positive example of a negotiated transfer and an inclusive political process, but gradually it became clear that it had failed to achieve buy-in from key elite actors. In September 2014, an armed group, commonly referred to as the Houthi movement, took control over the capital, Sana'a, and after a brief intermezzo where the UN sought to (re)commit the warring parties to political negotiations, the political process collapsed. The situation quickly escalated as Hadi and his government were placed under house arrest. In mid-February 2015, Hadi escaped from house arrest and travelled to Aden, the former capital of South Yemen, which he announced as his interim capital. However, within a month Aden was under attack from the Houthis and Hadi fled to Saudi Arabia. At this point, Hadi requested the UN and the Arab League for support by all available means including military intervention with reference to the UN Charter Article 51 and the right to selfdefence, as well as the Charter of the Arab League and the Treaty on Joint Defence, in March 2015 just before the commencement of the Saudi-led military intervention. 1 In the announcement of the Saudi-led military intervention by the Saudi ambassador to the US, Adel al-Jubeir, the objective of the intervention was 'to defend the legitimate government of President Hadi from the takeover attempts by the Houthi militia in Yemen'. 2 Although Saudi Arabia has a long history of interfering in Yemeni politics, the 2015 military intervention stands out for its intensity. Hence, researchers and analysts have discussed the reasons for this shift in Saudi foreign policy, pointing to a combination of internal Saudi politics and structural shifts following the Arab Uprisings