The calculated distance (air line) between Ruska Poliana and Pereiaslav is approximately 50 miles respectively 80 kilometers.
By car or train, the actual journey to Pereiaslav is certainly longer, as only the direct route (as the crow flies) between Ruska Poliana and Pereiaslav has been calculated here.
Air line (approximately)
80 kilometers
43 nautical miles