OOC: A blockade by definition is the use of military force to bar the import or export of any and all goods from a country.
The Ft Lauderdale nations are imposing sanctions, thereby increasing the duties and tariffs of French and British goods in their respective nations, thereby increasing the price while reducing profits. They are not preventing you from selling anything anywhere, nor have the enacted an embargo which would bar any and all importation or exportation of your goods into their nations.
In an RL example, Hydra is Walmart and Target, the opposition are state governors. Because of the unfair business practices of Walmart and Target in Thailand, the state governors pass increased taxes on their goods in their collective states. They have not barred either retailer, nor are they calling for their closure, just a minor cut into their profits until they cease their exploitation of Southeast Asia. Walmart and Target then announce they will be invading all states that signed the agreement and anyone else who does and will not stop until the resolution is rescinded. If/when they win, would people still shop at Target or Walmart? Can Target and Walmart force people to shop there? Because thats what you two are demanded. "We get the best prices, no one can trade with anyone else without our permission (See: CSA and Korea, Ukraine and Ottomans, USA and Siam), and everyone has to buy our stuff." You're literally forcing the whole world to team up against you because neither of you will admit that this is the most baseless cause of war since the War of Jenkin's Ear (which was a real war) in the 1700s. You cannot force people to buy a product, not in RL and not in a game. You don't think after their fathers, sons and brothers die in this senseless war that Americans will be jumping with joy to buy British goods? That Austrian civilians will happily purchase French materials? No, they'll boycott. And as Nelson Mandela and Dr. Martin Luther King showed quite convincingly, if enough people boycott something, their target will break before they do. And theres not a damned thing any government can do about it.