The calculated distance (air line) between Pervomayskoye and Stary Krym is approximately 77 miles respectively 123 kilometers.
By car or train, the actual journey to Stary Krym is certainly longer, as only the direct route (as the crow flies) between Pervomayskoye and Stary Krym has been calculated here.
Air line (approximately)
123 kilometers
66 nautical miles