(i) Shortage of funds: the involvement of the United Nations Organization in large-scale operations results in a shortage of fund
(ii) Sovereignty of nations: The organization cannot effectively enforce its decisions because member states are not willing to surrender their sovereignty to its authority.
(iii) The veto power: Each of the five permanent members of the Security Council has veto power. The refusal of any of them on any issue under consideration.
(iv) Differences in ideology: There are differences in ideology, culture, politics and methods used in pursuing economic goals. This may negate the evolution of lasting peace in the world.
(v) Difficulty in achieving the goals of the organization: The achievement of the goals of collective security can be jeopardized by negative action by any of the Big- Powers - USA, Russia, Britain, France and China- determining the direction of events in the world.
(vi) No permanent Military force: The absence of a permanent military force is affecting its peace-keeping operations worldwide. The member countries provide troops only when called upon.
(vii) Problem of arms race: The UN has failed to find a permanent solution to the arms race, Many nations spend so much on the manufacture of weapons of war, e.g USA, Russia, France, Britain, Even some countries like Iraq and Iran equally do the same thing.
(viii) The presence of some regional/sub-regional groupings: some of these groupings like AU, ECOWAS, EEC, and the presence of some military pacts or alliances, e.g. NATO, WARSAW, and ECOMOG, have weakened commitment to the ideals and objectives of the UN
(ix) International Monetary Fund (IMF): It is an agency of the UN. Its neo-colonialist policies and conditionalities have crippled the economies of most states globally, especially the developing ones.
(x) Constant border clashes/disputes: These are common among member nations, e.g India and Parkistan, France and Madagascar, etc.