Insist upon and Require

Require and insist upon are semantically related in demand topic. In some cases you can use "Require" instead a verb "Insist upon", when it comes to topics like dispute, stipulate, decide on conditions.

Require verb - To have as a requirement.

Insist upon and require are semantically related in ask topic. You can use "Insist upon" instead a verb "Require", if it concerns topics such as order.