The calculated distance (air line) between Ryazanskiy and Dzerzhinskiy is approximately 8 miles respectively 13 kilometers.
By car or train, the actual journey to Dzerzhinskiy is certainly longer, as only the direct route (as the crow flies) between Ryazanskiy and Dzerzhinskiy has been calculated here.
Air line (approximately)
13 kilometers
7 nautical miles