Letter of Protest
Encyclopedia
A letter of protest or diplomatic note is a diplomatic
Diplomacy
Diplomacy is the art and practice of conducting negotiations between representatives of groups or states...

 document presented by one state's foreign ministry to another state.

A letter of protest is written in a highly formal manner, intended to be both courteous and critical at the same time. For example, in order to express exceptionally strong anger towards a foreign government's policy, a letter of protest would say "We condemn this action in the strongest possible terms".
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