Interfering in another country's domestic affairs; political intervention in a state's internal matters (usually used negatively in diplomatic contexts).
外務省は他国への内政干渉を避けるよう声明を出した。
The Foreign Ministry issued a statement urging avoidance of interference in other countries' domestic affairs.
その国は選挙への関与が内政干渉に当たると非難した。
They condemned the involvement in the election as interference in domestic affairs.
国際法では主権尊重と不干渉が基本原則とされ、内政干渉は問題視される。
In international law, respect for sovereignty and non-interference are basic principles, and interference in domestic affairs is seen as problematic.