Maximum neighbor hypothesis

The Maximum neighbor hypothesis (hipótesis vecinal máxima in Spanish) or neighbor hypothesis 3 (hipótesis vecinal 3; HV3 in Spanish) is a strategic concept used in international analysis and defense in Chile since the late 19th century. It argues that in the event of a conflict with one neighboring country, it is highly likely that the other two border countries will side with the first one against Chile.

Source: Wikipedia — Maximum neighbor hypothesis (CC BY-SA 4.0)