Most popular word is "treaty", for example NATO = North Atlantic Treaty Organisation.
You can also look for Vienna Convention On The Law Of Treaties (from 1969) to find out more about such agreements.
Mutual aid agreements and assistance agreements provide:
b. Mechanisms to quickly obtain emergency assistance in the form of personnel, equipment, materials, and other associated services
the council of economic assistance founded in 1949 was intended to provide financial support to African nations previously under Asian domination
the USSR boycotted the session of the Security Council at which the decision was made.
After WW II, the Truman Doctrine was that the United States would provide political, military and economic assistance to all democratic nations under attack from authoritarian nations (ie USSR, North Korea).
Mutual aid agreements and assistance agreements provide:
Greece and Turkey
In one useage as a noun - aide is a person, aid is a thing - both provide assistance.
The government agency HUD (www.hud.gov) may provide you with rental assistance, should you be out of work, or make low income.
Public Assistance
The acronym CERF stands for the Central Emergency Response Fund. CERF was established by the United Nations to provide timely assistance to victims of natural disasters or armed conflicts.
To provide economic assistance to Latin America. (novanet)