Is the United Nations an Effective Institution? (just essay) Part 1/2. What is your opinion?

In this year, the United Nations celebrates its 70th anniversary. This is a good occasion to analyze how effectively this organization perform its duties during this time.
Western countries and many politicians from the Third World regard the UN as an inde-pendent independent (one word) international institution that brings together 193 countries who defends the values of internationalism, multilateral action, democracy, pluralism, secularism, compromise, human rights and freedoms. But is it real? (I think 'In reality, does it actually achieve this' is better than 'but is it real', because the organization does exist, i.e. is real, but it might not be effective. Also, try not to start a sentence with 'but')
The modern world is divided into two camps. Some argue that this organization has never been an effective tool of permission (not sure if 'permission is the right word, maybe 'combating') the pressing problems of mankind and today is not too. Nei-ther Neither a bipolar nor unipolar world did not give her the UN a chance to prevent local conflicts, ensure non-proliferation of nuclear weapons, promote democracy, and solve issues of combating poverty and promoting sustainable development of all countries.
Other researchers, noting the disadvantages of the United Nations, do not apt to deny the positive results of its operations. They believe that this organization has prospects potential, and it can be successfully reformed. Politicians and experts belonging to this group, emphasize that the very existence of the United Nations is important due to the needs of the world community, and it would be un-wise unwise to disband refuse it without trying to improve it and strengthen it.
If we look at history, we remember that the atrocities and massacres during the Second World War prompted the governments to think that it was necessary to create an organization that will help prevent such tragedies in the future. The UN was founded in 1945 for the noble purpose of "saving future generations from the scourge of war." Despite this, after creation of this organiza-tion organization the world has had more than 250 conflicts in which the United Nations had shown its complete inability to achieve the purpose for which it was created. Here are some examples.
In 1994, the UN did nothing to prevent the genocide in Rwanda, which killed nearly 1 million people. This is because the Security Council had decided not to send peacekeepers there. The UN did not intervene in the Second Congo War in the Democratic Republic of the Congo (1998 - 2002 years). The peacekeeping mission was deployed in the country only in February 2000. However, the refuse refusal of the UN to the an earlier intervention in the conflict led to the deaths of 5 million people in this war. Finally, the Ukrainian crisis. This is not a complete list of all the failures of the UN.