U.S. sanctions rules generally apply to U.S. persons. That means that not only U.S. citizens and residents, but also anyone within the territory of the U.S. must comply. It also means that companies registered in the U.S. are liable under the rules. For some sanctions, foreign subsidiaries of U.S. companies must also comply. Sanctions are a strict liability regime. That means that any violation of the rules can result in a penalty, regardless of intent.