UNCLOS does not require U.S. to ask permission before boarding a ship, thats already ruled out by 1958 convention

[MYTH] As a nonparty, the U.S. is allowed to search any ship that enters our EEZ to determine whether it could harm the United States or pollute the marine environment. Under the Convention, the U.S. Coast Guard or others would not be able to search any ship until the United Nations is notified and approves the right to search the ship.

• Under the Convention, the UN has no role in deciding when and where a foreign ship may be boarded.
• Under applicable treaty law – the 1958 conventions on the law of the sea – as well as customary international law, no nation has the right to arbitrarily search any ship that enters its EEZ to determine whether it could harm that national or pollute its marine environment. Nor would we want countries to have such a blanket “right,” because it would fundamentally undermine the freedom of navigation that benefits the United States more than any other nation.
• Thus, the description of both the status quo and the Convention’s provisions is incorrect. The Convention makes no change in our existing ability or authority to search ships entering our EEZ with regard to security or protection of the environment.