For more than a decade, Kurdish forces in northeastern Syria were America's most trusted ally, spearheading the war against Isis, taking responsibility for guarding thousands of jihadi prisoners of war, and in the process carving out an autonomous statelet that seemed poised to realise the dream of Kurdish independence. Over the past few weeks, that dream as has been crushed. In a sudden offensive, Ahmed Al Sharaa's transitional Syrian government has evicted the Kurds from vast territories