North Korean garden gnome, Kim Jong-Un, is reported to have recently overseen exercises that simulated a special forces attack on South Korea's busy Incheon airport.
The attack involved airborne troops dropped onto the airport from An-2 biplanes like this one.
With a cruise speed of 120 mph. and a really loud, radial engine, the venerable An-2 (NATO designation "Composter") can drop a squad of 10-paratroopers, eventually, somewhere. The idea that 15-of them would be able to get into South Korea undetected is, however, a bit of a stretch.