What is the difference between intellectual invasion and cultural invasion, and what is the difference between invasion and conquest, along with their definitions?

Intellectual and cultural invasion are either closely related or share a general and specific relationship. Intellectual invasion is when enemies raid with various weapons and methods to destroy the nation's strengths and foundations. It differs from military invasion in that it aims to liquidate minds and understandings so they become subservient to the invader. As for cultural invasion, it is an attack by a political or economic group on the cultural foundations and components of a nation with the aim of achieving its own ends and replacing the original beliefs and culture with new ones.