Six Nato countries are planning to develop a “drone wall” to help defend their borders with Russia after a series of provocations, ranging from forced migration to attempts to amend the frontiers.
六个北约(NATO)国家计划建立一道“无人机墙”以帮助守卫其与俄罗斯接壤的边界，此前这些国家遭遇了从强迫移民到试图修改边界线的一系列挑衅。
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