VOA英语视频：乌克兰军队等待美国武器之际，俄罗斯看到“机会之窗”

Russian forces are expanding their attacks on Ukrainian border settlements close to the northeastern city of Kharkiv, opening up a new front in the war. With U.S. and European weapons finally due to arrive on the front lines in the coming weeks following delays, can Ukraine hold back Moscow’s invading troops? Henry Ridgwell has more