The U.S. State Department has approved a potential 2.2-billion-USD arms sale to China's Taiwan in June. China's Foreign Ministry expressed its strong opposition and urged the U.S. to stick to the one-China policy. What's really driving this sale between U.S. and China's Taiwan? And how will this further impact relation between U.S and China? Zhang Junshe, Senior Captain and Vice President of China's Naval Research Institute, shared his thoughts during an interview with CGTN.