BY INTERNATIONAL LAW. This is even commonly accepted. The Shah allowed for bypass of Hormuz, that is the only reason SOME parts of the Western world have such a grip there (the usual imperialists). So please, put yourself out of misery - the world needs less ignoramuses.
Munich council upholds ban on Holocaust 'stumbling stone' memorials (AP)
from the article: Iran: We will cut oil flow if West imposes economic sanctions