'Staunch' friend of Taiwan's to become top US diplomat in Taipei, sources say. Raymond Greene, currently the deputy chief of mission at the U.S. embassy in Tokyo, is set to become the top U.S. diplomat in Taipei this summer. His arrival aligns with the inauguration of Taiwan's new president, amidst rising tensions with China. Greene, known as a firm supporter of Taiwan, previously served as deputy head of the American Institute in Taiwan (AIT) and is noted for his diplomatic experience in Asia.