The United Nations has no army, but it does have UN Peacekeepers.
UN police and military personnel are "contributed" to serve under the blue flag from over 100 countries to carry out the mandates defined by the Security Council.
Military operations aim to protect populations against threats and contribute to a secure environment. Policing is central in preventing, mitigating and resolving violent conflict and contributing to early peacebuilding and reconciliation.
Uniformed personnel are contributed and deployed under several different types of arrangements.
The goal of UN Peacekeepers is to create conditions for lasting peace.
Peacekeeping is guided by three principles: consent of parties (countries must invite UN peacekeepers to enter; the UN cannot just send peacekeepers anywhere), impartiality, and non-use of force except in self-defense and defense of the mandate written in the resolution.
They come from nations large and small, rich and poor. They bring different cultures and experience to the job, but they are united in their determination to foster peace.
From Southeast Asian countries, herewith our number of troops as contributors.
... and Indonesia is the 8th largest contributor in the world!
Source : United Nations Peacekeeping Official Website