Which names the policy of remaining separate from the affairs of other countries or groups?

The policy of remaining separate from the affairs of other countries or groups is called isolationism.

Explanation:

Isolationism is the political tendency of a people or nation to turn away from the world outside of them. It usually happens from fear of being dominated from a cultural, military or economic point of view, or on the contrary from turning away from that perceived threat. Autarky is the goal as a means to maintain isolationism.

In a different context, isolationism can also mean that a country does not interfere with the affairs of other countries without a country actually separating itself from the rest of the world (a kind of non-interventionism). Switzerland can be mentioned as an example of this.

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