Answer: China traditionally has looked to its neighbors in the East Asian region as the most important countries in its foreign policy domain. These are states that had tributary relationships with China in the Qing dynasty and before. It is a region that is heavily influenced by Chinese culture. Japan’s culture is substantially derived from Tang Dynasty China. Korea’s was strongly influenced by China’s art and religion. Same holds true for Southeast Asia, Vietnam in particular. The spread of Buddhism from India through Tibet into traditional China and then outward to northeast and Southeast Asia, along with Confucianist thinking in Northeast Asia, also has provided a unifying foundation. Japan, Korea, and Vietnam all used Chinese characters for writing their language for centuries, and Japan still does.
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