A moral imperative to intervene  When a massacre is about to happen it is legal to intervene to prevent that massacre. The ‘Responsibility to Protect’ which was accepted by the UN in 2005. Resolution 60/1 at the 2005 World Summit stated, there was international responsibility “to help to protect populations from genocide, war crimes, ethnic cleansing and crimes against humanity. In this context, we are prepared to take collective action in a timely and decisive manner.” Though this will only happen “should peaceful means be inadequate and national authorities are manifestly failing to protect their populations”. [1] This is most certainly the case in Syria where the national authorities are the ones doing much of the killing.  It must be proved that the Syrian regime is responsible for the attacks; the US and UK say there is such evidence but so far the link is not crystal clear. Even the UK government accepts that there must be “convincing evidence, generally accepted by the international community as a whole, of extreme humanitarian distress on a large scale, requiring immediate and urgent relief”. [2] As the doctrine states peaceful means must have been tried – and in Syria after two years of conflict we can safely say a peaceful resolution is not in sight. And the use of force must be proportionate – which since there is no plan for a full scale invasion in Syria it will be. [3]  [1] United Nations General Assembly, ‘Responsibility to protect populations from genocide, war crimes, ethnic cleansing and crimes against humanity’, Resolution 60/1 2005, p.30   [2] ‘Chemical weapon use by Syrian regime – UK Government legal position’, gov.uk, 29 August 2013,   [3] Cassese, Antonio, ‘Ex iniuria ius oritur: Are We Moving towards International Legitimation of Forcible Humanitarian Countermeasures in the World Community?’, EIJL, Vol.10, 1999,