25 Sep A “Broad Consensus” — of Between Two and Four States
Yes, the “unwilling or unable” test marches on. The latest step forward is a Just Security blog post by Kate Martin, the Director of the Center for National Security Studies, that cites absolutely nothing in defense of the test other than another scholar who cites almost nothing in defense of the test. Here is what Martin says in the context of the UK’s recent drone strikes in Syria (emphasis mine):
Some issues raised by the UK Article 51 legal theory are less controversial than others. The US and other states understand customary international law to include the right to use military force in self-defense against armed attacks, and claim the right to use military force under Article 51 outside of an armed conflict. As Lubell has noted, there is support for reading Article 51 as justifying the use of military force against non-state actors. There is broad consensus that there is a right to use military force in self-defense when the host country is unable or unwilling to stop the attack.
And what does Martin offer in support of this “broad consensus”? A link to a blog post at Lawfare by Ashley Deeks, in which Deeks (1) correctly points out that the US and UK both support “unwilling or unable,” (2) claims that “France appears to be prepared to invoke the ‘unwilling or unable’ concept in the Syria context,” and (3) states that Australia is “apparently relying on a collective self-defense of Iraq/unwilling and unable theory.”
So at most there is a “broad consensus” of four states in support of “unwilling or unable.” And perhaps there are only two. That’s quite a consensus.
This isn’t even instant custom. This is custom by scholarly fiat.