Embargo and Blockade

An economic embargo restricts trade or other economic dealings with a country, while a naval blockade uses military force to prevent vessels from entering or leaving specified ports or coastal areas. The central distinction is the method of enforcement: an embargo operates through economic rules and administrative controls, whereas a blockade physically obstructs maritime access.

How the two measures operate

Both measures can exert pressure by restricting supplies and commerce, but they are not interchangeable.

• An embargo may prohibit particular goods, such as arms, or cover a wider range of trade; its scope depends on the rules establishing it.
• An embargo is ordinarily enforced through domestic measures, including export licensing, customs controls and penalties for prohibited transactions.
• A naval blockade is enforced by military means against access to a defined maritime area, rather than merely by prohibiting transactions.
• A blockade can affect vessels of third countries attempting to enter or leave the blockaded area; an embargo does not, by itself, authorize interception of foreign shipping.

Legal basis and the use of force

The United Nations Charter distinguishes measures not involving armed force from military enforcement. The legality of either measure depends on its authority, purpose and implementation, not simply its label.

• Article 41 allows the Security Council to adopt measures not involving armed force, including complete or partial interruption of economic relations.
• Article 42 permits Security Council action through air, sea or land forces, expressly including blockade, when Article 41 measures would be inadequate or have proved inadequate.
• A unilateral embargo is not equivalent to a Security Council sanction, and its legality may raise questions under applicable treaties and international obligations.
• A naval blockade engages the Charter's prohibition on the threat or use of force; Security Council authorization and lawful self-defence are relevant legal bases for military action.

Rules and humanitarian consequences

Rules governing a blockade during armed conflict are distinct from the question of whether resorting to force was lawful. International humanitarian law regulates its conduct and protects civilians.

• A blockade must be declared and notified, must be effective, and must be applied impartially to vessels of all states.
• A blockade is prohibited if its sole purpose is to starve civilians or deny them objects essential for survival.
• A blockade is also prohibited if expected civilian harm is excessive in relation to its anticipated concrete and direct military advantage.
• Economic embargoes can also harm civilian welfare, but those effects do not turn an economic restriction into a naval blockade.