What is a formalized agreement between countries to help each other in case of attack?

Answer

These are often referred to as a "Treaty" or an "Alliance" between the countries.
Q&A Related to "What is a formalized agreement between countries..."
Erm...an alliance? Military pact? Secret backroom agreements that no one ever hears about? >_> Edit: Yes! Mutual defense mahnamahna! That sounds about right! xD Good job, other
http://answers.yahoo.com/question/index?qid=200804...
In order to meet the common threat represented by the Soviet Union, the Western powers created the North Atlantic Treaty Organization (NATO) in 1949.
http://wiki.answers.com/Q/What_alliance_was_formed...
An alliance
http://wiki.answers.com/Q/What+is+formalized+arran...
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