I found three different distances between these two cities. I think these are the differences between traveling as the crow flies, distance by train, and distance by plane. Here's the distance that's between the two extremes.
http://disween.com/moscow-id-us/khabarovsk-30-ru
Approximately how many miles separate Moscow and Khabarovsk?
2 answers
You can also use the mileage scale on this map. Not that Khabarovsk is near the Pacific Ocean in Russia's far east.
http://www.mapsofworld.com/russia/
http://www.mapsofworld.com/russia/