Demagogue

Because most of its leading members insist on treating it like one. The main way they do this is to ignore or undercut the collective decisions that are made at the U.N.

For example, despite the Security Council's unaminous approval of sanctions against North Korea, China has made it clear that it will not conduct searches of cargo going to and from North Korea for material that could be used to produce weapons of mass destruction.

In this article, a Korean professor had a clever way of summarizing how Japan, China and South Korea view the sanctions:

"The practical effect is questionable. They (the countries supporting sanctions) are in bed together but they're all dreaming different dreams."