VOA英语视频：美国防空导弹系统帮助乌克兰抵抗俄军空袭

Russia continues launching air attacks at Ukraine’s cities. But Ukrainian officials say the country’s skies are protected by weapons sent to Ukraine by its allies, and one of them — the U.S. Avenger air defense missile system — stands out. Anna Kosstutschenko reports. Camera: Pavel Suhodolskiy.