VOA英语视频：美国之音专访美国驻联合国大使托马斯-格林菲尔德

Linda Thomas-Greenfield, the U.S. ambassador to the United Nations, speaks with VOA Eastern Europe Bureau Chief Myroslava Gongadze in Warsaw about her recent visit to Ukraine and her meeting with the nation's president, Volodymyr Zelenskyy.