KYIV — Ukrainian forces are pulling back along parts of the frontline under fierce Russian pressure; Ukrainian President Volodymyr Zelenskyy blamed the difficult situation on a lack of weapons for his soldiers. That's likely to increase pressure from Kyiv during next week's NATO Washington summit for its allies to speed up arms deliveries. “This is not a stalemate, but a problematic situation," Zelenskyy told Bloomberg on Thursday. "A problem can be solved if there are tools and desire. We have the desire, but the tools have not arrived. We have brigades without weapons. We have 14 brigades that do not...