They probably developed their own docking mechanism that is incompatible with anyone else’s. Sounds like they may wind up okay, and I’m sure they can be kept supplied until an empty crew vehicle can auto-dock with the station.
Oddly, the Russians, who helped in the development of our "International Docking Standard" docking tech, don't actually use it. They use their own system, which -- again oddly -- is closer to what we used on the Apollo program than it is to the "international standard" docking mechanism we use now.