Ukraine’s long-range drone fleet launched a highly effective overnight assault against Russia’s domestic energy network early on Sunday morning, May 31, executing successful deep-strike operations that left a key Rosneft oil refinery and an inland fuel depot heavily ablaze, DW and Exilenova+ Telegram channels reported. Rosneft refinery targeted in Saratov The most economically damaging blow was delivered in the Saratov region, where Ukrainian strike assets successfully bypassed local electronic