Mỹ thừa nhận tụt hậu với Nga về phát triển vũ khí siêu thanh
Bộ trưởng Quốc phòng Mỹ Mark Esper khẳng định, nước này buộc phải đuổi kịp Nga trong việc phát triển vũ khí siêu thanh.
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(Vietnam+)