US officials believe these pro-Ukrainian agents inside Russia carried out a drone attack that targeted the Kremlin in early May by launching drones from within Russia rather than flying them from Ukraine into Moscow. But US officials believe that Ukraine has developed sabotage cells inside Russia made up of a mix of pro-Ukrainian sympathizers and operatives well-trained in this kind of warfare. Asked for comment, a spokesperson for the head of the Ukrainian Security Service suggested to CNN that the mysterious explosions and drone strikes inside Russia would continue. ‘A culmination of months of effort’There has been a steady drumbeat of mysterious fires and explosions inside Russia over the last year, targeting oil and fuel depots, railways, military enlistment offices, warehouses and pipelines. A savvy military strategyPublicly, senior US officials have condemned the strikes inside Russia, warning of the potential for an escalation of the war.

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Persons: Russia –, ‘ Cash, they’ve, “, Volodymyr Zelensky, ”, Vasyl Malyuk, Kirill Kudryavtsev, Kyrylo Budanov, Budanov, Zelensky, ” Budanov, Nicolas Vaujour, ” Vaujour, Vladimir Putin Organizations: Washington CNN —, CNN, Kremlin, Ukrainian, Reuters, Ostorozhno Novosti, Ukrainian Security Service, Security Service, Getty, Pentagon, CIA, Washington Post, Yahoo, Joint Staff, UK Ministry of Defense Locations: Washington CNN — Ukraine, Russia, Ukrainian, Ukraine, Moscow, Russian, Ostorozhno, AFP, Russia’s Rostov, Rostov Oblast, Moscow’s, ”, Belgorod, Russia’s