Is the United Nations relevant in today's world?Watch
Second, the United Nations is unable to take direct and independent actions without support from its members. In other words, the U.N. is completely powerless and pacifistic. In a world filled with war-mongering dictators and suppressing regimes who know the U.N. lacks any real power, regimes are almost completely free to do whatever they want. For example, North Korea has tested nuclear weapons and threatens to do so again, with the United Nations only considering sanctions.
Adapted from pillforhumanity.com