The calculated distance (air line) between Sievierodonetsk and Vuhlehirsk is approximately 45 miles respectively 72 kilometers.
By car or train, the actual journey to Vuhlehirsk is certainly longer, as only the direct route (as the crow flies) between Sievierodonetsk and Vuhlehirsk has been calculated here.
Air line (approximately)
72 kilometers
39 nautical miles