"Do the agreements and decisions of the UN equally apply to the President of the USA?"
It depends on how the resolution is worded. Security Council Resolution 687 is the one which forbids Iraq from having certain weapons, and those provisions apply only to Iraq.
Unfortunately the UN Web site is down right now, but when it comes back up you should be able to access it through this link:
Register for free to join our community of investors and share your ideas. You will also get access to streaming quotes, interactive charts, trades, portfolio, live options flow and more tools.