Do you really think that International law is same thing as the UN?

International law is essentially 2 or more soveriegn nations reaching some agreement and a number of other countries accepting this agreement.
For example, the cease fire agreement of Gulf war I contained an agreement which defined the "no fly zone" over Iraq. Normally, according to international law a nation has soveriegnty rights in regards to it's airspace, but because of the international law established by cease fire agreement, Iraq's ownership rights were limited in regards to it's airspace. [Saddam can violate international law simply by having airplane take off and thereby enter this air space].