Answer :
When an aggressor threatens or employs military action against a member state, members of an international cooperative institution may occasionally choose to work together to defeat the aggressor by assembling a powerful coalition. This is referring to what form of collective security.
A security arrangement that is political, regional, or global and in which each state agrees that the security of one is a concern of all and pledges to respond to threats to and violations of peace collectively is referred to as collective security. In that it aims to include all governments within a region, or even the entire world, and to meet a wide spectrum of potential dangers, collective security is more ambitious than systems of alliance security or collective defence. Although the concept of collective security has a long history, its practical application has been difficult. For it to stand a chance of working, a number of requirements must be satisfied. It is the notion or practice of states committing to defend one another to fend off aggression or to find a transgressor if international law has been broken.
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