Or maybe they're simply paying too much for their Tomahawk Cruise Missiles. They could probably get some cheaper rockets off some ****.
Not a lot of people know that during the Korean war Gen Douglas MacArthur came up with a cunning plan to launch a series of pre-emptive tactical nuclear strikes against China. Harry Truman had to personally fly to Korea to haul MacArthur back home and into retirement. WW3 narrowly avoided.
Technically the Korean War has never ended, they are just on a ceasefire just now and have been since 1953