A naval blockade is a military operation in which one nation deploys warships to physically prevent vessels from entering or leaving another nation's ports, coastline, or strategic waterway. Under international law, a naval blockade is considered an act of war — it is explicitly recognized as a casus belli under customary international law and the UN Charter's prohibition on the use of force. The United States has historically referred to blockades as "quarantines" to sidestep the legal act-of-war designation, as in the 1962 Cuban Missile Crisis. A blockade of the Strait of Hormuz would affect not only Iran but every nation whose commercial shipping passes through the strait, raising questions about third-party rights under international maritime law and the UN Convention on the Law of the Sea (UNCLOS).
A naval blockade is an act of war under international law, with global economic consequences. It can disrupt oil supplies, food imports, and commerce for third-party nations that had nothing to do with the underlying dispute. Understanding blockade law is essential to assessing major conflicts.
People often think a blockade is just a military tactic. Under international law, it's an act of war. The U.S. called the Cuban Missile Crisis action a "quarantine" to avoid the legal act-of-war designation—a reminder that nations sometimes sidestep legal terms to achieve their goals.
A naval blockade is an act of war under international law, with global economic consequences. It can disrupt oil supplies, food imports, and commerce for third-party nations that had nothing to do with the underlying dispute. Understanding blockade law is essential to assessing major conflicts.
People often think a blockade is just a military tactic. Under international law, it's an act of war. The U.S. called the Cuban Missile Crisis action a "quarantine" to avoid the legal act-of-war designation—a reminder that nations sometimes sidestep legal terms to achieve their goals.