Sanctions imposed by the U.S that hold no merit according to WTO or International law aren't even legal and are in fact considered an act of war. The only crime committed here is by the U.S.
Meng's arrest is for actions she allegedly took to help Iran evade sanctions years ago, during the period in which U.N. sanctions on Iran were in force.
https://www.bloomberg.com/news/articles/2018-12-07/huawei-s-...