Ryazan refinery hit — production halted after drone strike Reuters reports that Russia’s fourth-largest oil refinery in Ryazan urgently shut down its main crude distillation unit (AVT-4) after a Ukrainian drone attack. Industry sources say several related units — reforming, hydro-treating, and catalytic cracking — were also stopped. The result: disrupted fuel processing, strained logistics, and growing tension deep inside Russia’s “safe zone.” Long-range drones keep proving — the war reaches far