Mutual Defense Pacts (often referred to as MDP's) are a type of interalliance treaty wherein the signatory alliances agree to defend each other from attack by other alliances.
There is also a variant of the MDP and you may see it sometimes as MnDP. MnDP is the acronym for Mutual Defense Pacts that have a non-chaining clause in them, (here's an example of a non-chaining clause). The non-chaining clause is put into some MDoAP or MADP's so that if one signatory assists another alliance via a separate treaty, the treaty with the non-chaining clause becomes optional. These are used to limit to expansion of conflicts if people don't want to be involved for one reason or another.
MDP's are one step above ODP's and one step below MDoAP's on the Spectrum of Interalliance Treaties.
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