Can you provide source of your outlandish claim?
Insure profitably? Sure. At some point, the cost of the premium exceeds the cost of the thing being insured, making it pointless to insure.
Some people describe this scenario as something being "impossible to insure", but it's not meant in the literal sense. In fact I would argue that there is no insurance company that would decline to insure a $100 million cargo through a combat zone, if the premium offered was $150 million.
> Insurance industry sources said that war risk premiums had stayed firm on Monday at between 0.05% to 0.1% of the value of a ship, from around 0.03% estimated last week before the attacks.
https://www.reuters.com/world/middle-east/war-risk-insurance...