Abstract
The extraterritorial effect of the U.S.secondary sanctions has been quite controversial in international law. The paper demonstrates the extraterritorial validity of different kinds of rules from perspectives of American law and international law.As domestic law of the United States, the secondary sanctions rules do not breach the existing framework of jurisdiction.The legality of unilateral economic sanctions has been argued in international law.Firstly, the legislative jurisdiction of secondary sanctions is not consistent with traditional customary international law.Secondly, some of the specific measures even violate the WTO rules with the dispute settlement mechanism.Finally, unilateral economic sanctions also have a significant impact on the conflict rules of in traditional private international law.Unilateralism of the secondary sanctions rules in the process of implementation was strongly protested by nations, of which take different counter-measures.Base on the national capabilities, China should improve the legislation and judicial system, take appropriate counter-measures and safeguard the national interests and actively promote the construction of foreign-related rules.