Born out of the ashes of the Second World War, the United Nations has made a major contribution to maintain international peace and security. Based on common goals, shared burdens and expenses, responsibility and accountability, the UN helped to reduce the risk of a repetition of a Word War, to reduce hunger and poverty, and promote human rights. But today, the legitimacy and credibility of the UN have been seriously undermined by the desire of some countries to act alone, abandoning multilateralism. So, do we need the UN today?