Answer :
A war that is designed to stop an attack that is imminent, when foreign troops are massed and ready to invade is called a preventive war.
A preventive war is an armed conflict initiated by a country in order to stop a potential threat from materializing, such as an adversary making a move that might cause them to become stronger in the future. The logic behind preventive war is that waiting for an adversary to get stronger makes them a greater threat and might cause even greater damage if the country is attacked.
A preventive war is thus carried out to avoid a potential future conflict by defeating the enemy before they become too strong. In a preventive war, foreign troops are massed and ready to invade. Such a war is carried out with the aim of averting a perceived future threat, rather than responding to an existing attack. It is intended to prevent an enemy from obtaining the capacity to harm the initiator's interests.
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