A formal agreement between foreign nations is commonly called an accord. However, they also can be called international agreements as well.
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A formal agreement between two or more nations is called a treaty.
A formal agreement between two countries is called a treaty or a pact.
The League of Nations
If you mean the Locarno Treaties which was a promise between Germany and the allies to never attack one another, then that was in 1925.
The meeting was called upon and the paper they signed was The Munich Agreement.