Since last week Turkey has been using massive military force in Syria. Turkey has decided to call her military operation ‘Peace Spring’. ‘Peace Spring’ seems to be even more extensive than ‘Olive Branch’, Turkey’s preceding invasion of Syria. ‘Peace Spring’ has already resulted in the flight of tens of thousands of civilians. Worldwide, observers fear that ‘Peace Spring’ could lead to a humanitarian catastrophe in Syria, a country whose people have been suffering from unspeakable pain for many years now. There is also widespread fear that the so-called ‘Islamic State’ could benefit from ‘Peace Spring’ as the use of force is being directed against precisely those Kurdish forces that had helped keeping the ‘Islamic State’ at bay. It thus appears that a depressingly large number of indications suggest that the name ‘Peace Spring’ is a cynical euphemism for a brutal military course of action possibly ending in a bloody disaster.
In her letter to the United Nations, Turkey invokes her right of self-defence, as recognized in Article 51 of the UN Charter, ‘to counter’ an ‘imminent terrorist threat’. The ‘facts’ that Turkey refers to in this letter are essentially those:
‘In particular, PKK/PYD/YPG units close to Turkish borders in the north-east of Syria, continue to be a source of direct and imminent threat as they opened harassment fire on Turkish border posts, by also using snipers and advanced weaponry such as anti-tank guided missiles.’
Under international law, the right of self-defence exists if an armed attack against another State occurs. In such a case, cross-border defensive forcible action is permissible to the extent that the action is necessary and proportional to counter the attack. The existence of a right of anticipatory self-defence has long been controversial. An arguable case can be made that such a right exists if an armed attack against a State is imminent. It is also a matter of fierce debate whether a right of self-defence exists in case of a non-State armed attack and whether it may justify forcible defensive action on the territory of another State. An arguable case can be made that such a right exists where a State is either unwilling or unable to prevent a non-State group from conducting a large-scale cross-border armed attack from the territory of that State – under strict conditions of proportionality.
Even on the basis of such a broad understanding of the right of self-defence, which is being fiercely rejected by a significant number of States and by a significant number of highly respected international lawyers as being unduly permissive, it is impossible to see how Operation ‘Peace Spring’ could be justified under international law. Read the rest of this entry…