The calculated distance (air line) between Krasnogorsk and Dolgoprudnyy is approximately 11 miles respectively 18 kilometers.
By car or train, the actual journey to Dolgoprudnyy is certainly longer, as only the direct route (as the crow flies) between Krasnogorsk and Dolgoprudnyy has been calculated here.
Air line (approximately)
18 kilometers
10 nautical miles