Tensions between Baku and Yerevan have mounted in recent weeks over a Russian-patrolled land corridor linking Armenia to the next-door Nagorno-Karabakh region. Although most of Nagorno-Karabakh’s roughly 120,000 inhabitants are ethnic Armenians, the region is internationally recognized as part of Azerbaijan. Yerevan accuses Azerbaijan of blocking its only land route to the region—the so-called Lachin…