Military alliance
Alliance between different states with the purpose to cooperate militarily / From Wikipedia, the free encyclopedia
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A military alliance is a formal agreement between nations that specifies mutual obligations regarding national security. In the event a nation is attacked, members of the alliance are often obligated to come to their defense regardless if attacked directly. Military alliances can be classified into defense pacts, non-aggression pacts, and ententes. Alliances may be covert (as was common from 1870 to 1916) or public.[1]
According to a 2002 dataset of military alliances, there have been 538 alliance treaties from 1815 to 2003.[2] The vast majority of the alliances involve commitments to come to the military support of one ally involved in war.[2] The vast majority are defensive in nature.[2] Since the end of the Second World War, military alliances have usually behaved less aggressively and act more as a deterrent.[3]