A day after pledging Ukrainian President Volodymyr Zelenskiy their unwavering support, EU leaders on October 6 will face one of their worst political headaches on a key commitment -- how and when to welcome debt-laden and battered Ukraine into the bloc. The bloc has said since Russia's invasion that at the end of the war it would work steadfastly on "lasting unity" that would eventually translate into Ukraine's EU membership. The leaders will assess "enlargement" at their informal summit in southern Spain's Granada. Beyond Ukraine, several Western Balkan countries and Moldova are also knocking with increasing impatience at the door.