A little thing called Maritime Law. You can do the specific search if you want, I don't have the hours it would take to find the articles covering this issue. You can also search the National Archives database for relevant historical precedence. Try again.
U.N. Human Rights Chief: Israel's Blockade of Gaza Strip Is Illegal
United Nations human rights chief Navi Pillay on Friday accused Israel of violating the rules of warfare with its blockade stopping people and goods from moving in or out of the Gaza Strip.
In a 34-page report on the Israeli-Palestinian conflict, Pillay also called on Israel to stop expanding its West Bank settlements and punish all settlers who attack Palestinians.
U.N. Human Rights Chief: Israel's Blockade of Gaza Strip Is Illegal - International News | News of the World | Middle East News | Europe News - FOXNews.com
Of course you know I put little to no stock in the UN. In my humble but accurate opinion they are a joke and a tool.