The calculated distance (air line) between Dvubratskiy and Rostov-na-Donu is approximately 138 miles respectively 222 kilometers.
By car or train, the actual journey to Rostov-na-Donu is certainly longer, as only the direct route (as the crow flies) between Dvubratskiy and Rostov-na-Donu has been calculated here.
Air line (approximately)
222 kilometers
120 nautical miles