On Thursday, 6 April 2017, the US carried out a missile strike in Syria. It did so in response to the chemical attack which had taken place two days earlier in the town of Khan Sheikhoun, in the rebel-controlled part of Idlib province, killing 80 and seriously injuring more than 200 civilians. The chemical attack has been uniformly condemned. The US attack, however, has attracted not only criticism, but also statements of support and of praise. This is surprising provided that the two attacks both constitute a clear violation of some of the most fundamental norms of the international legal order. And the latter attack may potentially threaten the stability of this order, and the values it protects, no less than the former one.