Observers discussing the Russian tanks, infantry vehicles, ballistic missiles, and soldiers massed at Russia’s borders with Ukraine have framed the story as either a reawakening of Cold War tensions or as Vladimir Putin’s attempts to stoke nationalist sentiment at home. But there is a bigger and much older geopolitical story behind this buildup of troops.
If Ukraine brought Russia wealth it has always been more than that. It was and has been for many centuries the crucial logistical route for goods coming to and from the Russian heartland....