Answer:
The military alliance is the pact that refers to national security. The countries in this alliance search for mutual support and defense.
Step-by-step explanation:
In this pact, the main motivation for the countries is to protect themselves from the danger. Many countries accept entering these alliances as they expect the support of other countries in case of the crisis.
Some countries enter the alliance to meliorate the connection with another country. One of the most famous military alliance is NATO.