A state of emergency has been declared in the Russian city of Engels after a Ukrainian drone strike hit an oil depot that supplies Russia's nuclear bomber planes. Saratov regional governor Roman Busargin said that two firefighters had been killed while tackling the blaze. A huge fire exploded at the “Kristal” oil complex, as well as multiple explosions, in the city of Engels after long-range strikes, said Ukraine’s military. It added that the oil depot supplied fuel to the “Engels-2” military airfield, where Russia’s nuclear bomber fleet is based. “The strike of the oil depot creates serious logistical problems for...