The calculated distance (air line) between Dvubratskiy and Rostov-on-Don is approximately 137 miles respectively 220 kilometers.
By car or train, the actual journey to Rostov-on-Don is certainly longer, as only the direct route (as the crow flies) between Dvubratskiy and Rostov-on-Don has been calculated here.
Air line (approximately)
220 kilometers
119 nautical miles