The FAA has specific regulations for the required lengths of the Runway Protection Zone at ends of the runways. These are based on the size of the airplanes that the airport is rated from Category A (small general aircraft) to Category D (large commercial jet aircraft).
All federally registered airports are eligible for FAA safety grants to make improvements identified on their annual certification inspections.
There is also something called Engineered Materials Arrestor System that should slow a plane down.
https://en.m.wikipedia.org/wiki/Engineered_materials_arrestor_system
The Koreans must have thought what could slow a plane down faster than…. a concrete wall .