The North Korean Army is equipped with AK-47s and probably AKMs, both locally-produced variants and Russian-supplied guns, and I wouldn't be surprised to learn that there was quite a few Chinese Type 56 copies in service as well. They were equipped with the SKS before the AK, and undoubtedly large numbers still exist in service, mostly in the militia but surely in the regular service as well.
Communist nations have a habit of never throwing obsolete weaponry away. North Korea was flying the MIG-15 of first Korean War vintage all the way into the '90s, and may still be keeping them as suicide planes or something. They still have T-34 tanks of World War II vintage in storage, if not second-echelon service.
The SKS served with the Soviet Army in combat support/service support units all the way into the late '70s and possibly early '80s