关于四九论坛资料:　　Zhang Xiaogang： Taiwan is China’s Taiwan。 The Taiwan question is at the core of China’s core interests， and the first red line that must not be crossed in China-US relations。 Recently， the US side obscured， distorted and hollowed out the one-China principle through military aid and arms sales to Taiwan， and sending personnel to assist Taiwan in training its troops。 These moves sent a seriously wrong signal to the “Taiwan independence” separatist forces and severely undermined peace and stability across the Taiwan Strait。