'We will defend ourselves': Taiwan's president issues warning to China – video

Taiwan's president says her country will not provoke conflicts but will firmly defend its sovereignty and national security. Tsai Ing-wen delivers a video message in response to China's exercises, in which it fired missiles near Taiwan waters, a day after US house speaker Nancy Pelosi made a solidarity trip to the island.  Taiwan's president says: 'We are calm and not impetuous, we are rational and not provocative, but we will also be firm and not shirk.  Taiwan will never be knocked down by challenges'