On Sunday, President Trump issued a stark warning about NATO’s future, suggesting it could be bleak if allied nations do not assist in reopening the vital Strait of Hormuz amid rising oil prices triggered by the conflict with Iran.

In a conversation with the Financial Times, Trump emphasized that European countries and other global powers reliant on oil from the Gulf should join a U.S.-led initiative to secure the strait.

This passage is crucial, as it normally handles about a fifth of the world’s oil supply.

“It’s only fair that those benefiting from the Strait contribute to ensuring....