Constitution of the Republic of China (Taiwan) Article 38

The President shall, in accordance with the provisions of this Constitution, exercise the powers of concluding treaties, declaring war and making peace.
中文原文 中華民國憲法第38條
總統依本憲法之規定,行使締結條約及宣戰媾和之權。

English translation for reference only; the Chinese text prevails. Not legal advice.