Isolation: the state of being cut off or set apart from others; can be used as a noun, intransitive verb, or as a suru-verb.
災害時に孤立した地域へ支援物資が届いた。
Relief supplies were delivered to areas isolated by the disaster.
意見が異なるため彼はグループから孤立している。
Because his opinions differ, he is isolated from the group.
国際社会で孤立しないよう慎重に外交を進める必要がある。
It's necessary to conduct diplomacy carefully to avoid isolation in the international community.