North Korea has tested dozens of ballistic missiles in the last few years, from an intercontinental projectile capable of reaching the U.S. homeland and short-range ones that have plunged into the East Sea, to weapons launched from trains, submarines and vehicles positioned around the country.

Yet for all the quantity and variety, South Korea has managed to detect the North’s ballistic missile launches “100% perfectly” since Moon Jae-in became president in May 2017, Seoul’s defense ministry claimed on Thursday.