Russian Defense Minister Andrey Belousov (fourth from left) and Russian State Duma Chairman Vyacheslav Volodin (fifth from left) clap as North Korean leader Kim Jong Un speaks during the opening ceremony of a memorial museum honoring North Korean troops killed while fighting for Russia in the war against Ukraine, in Pyongyang on Sunday. | KCNA / VIA REUTERS

U.S. and allied threat calculus on the Korean Peninsula is changing “in fundamental ways” as North Korea crafts a new playbook based on what it has learned in the Ukraine war, the head of the U.S. military in South Korea has warned.

Far from being primarily about the battlefield use of drones, the most consequential lessons Pyongyang has taken from the conflict can be seen in its growing battlefield experience, its emerging ability to project force overseas and its increasingly rapid weapons development cycles, U.S. Army Gen.…