The United States on Thursday finally joined a growing number of its NATO allies in allowing Ukraine to use weapons donated by the West to strike military targets on Russian territory. Officials said Ukraine would only be allowed to defend the embattled Kharkiv region, which is under bombardment by missiles and glide bombs launched inside Russia. Furthermore, an anonymous official explained Kyiv would only be able to hit “Russian forces hitting them or preparing to hit them.” Though Volodymyr Zelensky’s spokesman welcomed the move, the Ukrainian president himself was more critical, saying the …