Better dig channels from the Azov sea to Caspian sea to Aral sea to Baikal, and form Azov / Caspian to Arctic Ocean and Baltic sea. Wide channels!
First, water transport is much cheaper and no need to maintain "roads". Second, this will transform tellurocratic russian "heartland" pushing it towards aggression against other countries to thallasocraties, that is, to what shaped European and Mediterranean civilizations.
https://bigthink.com/strange-maps/intercontinental-railway/