This question is an exact duplicate of:
Meng Wanzhou, CFO of Chinese multinational Huawei and daughter of its founder was detained on Dec 1, 2018 in Vancouver, Canada, at a request of the United States.
How do the United Stated justify this step? I guess the rationale is not that the United States imposed sanctions against Iran and that any citizens of third countries who do not implement the same sanctions may be arrested from now on. So were the sanctions also confirmed by an international body where China is affiliated and therefore co-liable for implementing them? Or is the step taken against a U.S. subsidy of Huawei where Ms. Meng may also serve as an executive and is therefore liable to U.S. law in this special capacity? I assume that Ms. Meng does not have U.S. (only Chinese) citizenship.
So what is the rationale that the U.S. cites (can cite) for detaining a foreign citizen in this case in terms of international law?