The Syrian Kurdish forces that spearheaded the battle to crush the Islamic State group’s self-proclaimed “caliphate” in 2019 warned Wednesday that the world’s lack of support risked allowing for a jihadist rebirth. The IS proto-state — which once administered millions of people across swathes of Syria and Iraq, on territory roughly the size of Britain — was declared defeated on 23 March, 2019. The US-backed Syrian Democratic Forces (SDF), which act as the autonomous Kurdish administration’s army, led the battle that flushed out the village of Baghouz where IS made its last stand. The SDF’s c…