The calculated distance (air line) between Chasiv Yar and Sievierodonetsk is approximately 38 miles respectively 61 kilometers.
By car or train, the actual journey to Sievierodonetsk is certainly longer, as only the direct route (as the crow flies) between Chasiv Yar and Sievierodonetsk has been calculated here.
Air line (approximately)
61 kilometers
33 nautical miles