Before and after taking office for a second time, U.S. President Donald Trump has been stirring up uneasiness among American allies. He said the EU is "very bad" for America and promised tariffs against European imports. He has talked about purchasing Greenland or using economic and military means to take control of the Danish territory because he said the U.S. needs the world's largest island for national security.

How have America's global allies been taking Trump's messages? What does a second Trump administration mean for traditional American alliances in Europe, Asia, and elsewhere? Host Liu Kun is joined by Kathleen Burk, Professor Emerita of Modern and Contemporary History, University College London; Jonathan Aronson, Professor of Communication and International Relations, University of Southern California; Teng Jianqun, Director for the Diplomacy Studies Center, Hunan Normal University.