一、问题的实质外国投资者在东道国领土上遭遇像征收之类的政治风险时,一个核心的问题是,东道国政府对他国国民所作出的承诺是否要受到国际法的约束。换句话说,如果东道国与外国投资者缔结了一份协议或合同,但是东道国政府事后违反了该协议或合同,如改变法律的条文,形成与原合同中所载约定不同的条件。问题是,东道国的行为是否构成对国际法的背反?或 I. The Essence of the Issue When foreign investors encounter political risks like collecting taxes on the host country’s territory, a central question is whether the host government’s commitment to the nationals of other countries is subject to international law. In other words, if the host country concludes an agreement or contract with a foreign investor, the host government violates the agreement or contract in the future, such as changing the provisions of the law to create conditions different from those contained in the original contract. The question is whether the host country’s conduct constitutes the opposite of international law or