Agreed. Here's a map from an earlier post.
Look at the maps of the two regions:
Rescue squads reached the scene of one crash in the Tula region south of Moscow early Wednesday morning and hours later found a fire that may be from wreckage of the second plane north of Rostov-on-Don.
Tula and Rostov-on-Don are no where near each other. It is just not possible for the planes to leave that closely together and the differing distance covered be so great.
Either they left nearly together, and the crashes are close, or they didn't leave together, and the crashes are further apart.
Agreed. Here's a map from an earlier post.