Vasily KrestyaninovLACHIN CORRIDOR—Scores of refugees are fleeing the disputed region of Nagorno-Karabakh in the aftermath of a massive Azerbaijani offensive that forced the ethnic Armenian majority to give up control of the war-stricken enclave last week.In a first since the mass exodus began on Sunday, The Daily Beast has gained exclusive access to the Lachin Corridor, the only road linking Nagorno-Karabakh—an internationally recognized region of Azerbaijan with an ethnically Armenian populati