FinanceRussian regional oil producer posts revenue rise but costs dent bottom lineHowever, outlook remains grim as hope for growth based on bringing online more unconventional heavy viscous oil depositsExpensive growth: a development well into unconventional heavy viscous oil reservoir at the Ashalchinskoye field in Tatarstan, Russia, that is operated by regional producer TatneftPhoto: TATARSTAN.RUVladimir AfanasievMoscow