By Yimou Lee and Ben Blanchard TAIPEI (Reuters) – A Chinese blockade of Taiwan or the seizure of an offshore island would be considered an act of war and Taiwan would not surrender, a senior Taiwanese security official told Reuters using unusually strong and direct language. While Taiwan President Tsai Ing-wen and others in her administration have repeatedly said that while they want peace they would defend themselves if attacked, the details of what Taiwan would consider an attack warranting a response have generally been left unsaid, given the many scenarios. Chinese military action might no…