The calculated distance (air line) between Khartsyzk and Chornukhyne is approximately 26 miles respectively 42 kilometers.
By car or train, the actual journey to Chornukhyne is certainly longer, as only the direct route (as the crow flies) between Khartsyzk and Chornukhyne has been calculated here.
Air line (approximately)
42 kilometers
23 nautical miles