Iran did not ratify the law, they are not bided by it. The straight will be controlled by both Oman and Iran . The straight is only 24 miles meaning that there is no international water and the ships can’t avoid entering Oman or Iran. Not to mention that blockade can be justifiable against enemy countries under self defense and national security. Europe had illegal sanctions for years on Iran missile program because Iran has a right like any other country to develop it’s military capabilities under the right of self defense