The calculated distance (air line) between Vladivostok and Kyŏngwŏn is approximately 89 miles respectively 143 kilometers.
By car or train, the actual journey to Kyŏngwŏn is certainly longer, as only the direct route (as the crow flies) between Vladivostok and Kyŏngwŏn has been calculated here.
Air line (approximately)
143 kilometers
77 nautical miles