Westad is also known for his work on Chinese and East Asian history and contemporary international affairs. In his books, he stresses the links between China and the outside world, noting that China's opening to the outside is not a new phenomenon. He often speaks of contemporary China, more than most countries, as a hybrid society, consisting both of Chinese and foreign elements. He has been critical of current Chinese foreign policy, which he sees as too nationalistic, although he is in favor of other countries working with China rather than trying to contain it.