Why did the United Nations prove to be ineffective at maintaining world peace during the Cold War? Only democratic countries were accepted into the organization, meaning that the UN could not police communist countries.
The Soviet Union refused to join unless the United States gave up its nuclear weapons.
The United States and the USSR could not work together on the Security Council, vetoing each other's priorities.
The United Nations had no power to intervene in conflicts, it could only try to get the two opposing sides to negotiate.