Ukrainian drone strikes deep inside Russia are causing “panic” for the Kremlin, EU top diplomat Kaja Kallas told AFP Wednesday, saying Moscow was lashing out at Kyiv with increased attacks. Ukrainian drones hit energy and military sites in Saint Petersburg on Wednesday as officials gathered for Russian President Vladimir Putin’s flagship economic conference in the city.JOIN US ON TELEGRAMFollow our coverage of the war on the @Kyivpost_official. “It clearly shows also panic on the Russian side -- why they are increasing the terrorist attacks that they’re doing in Ukraine is because they don’t know what to do with these things,” Kallas said in an interview. President Volodymyr Zelensky described the strikes as “fair” retaliation for Russia’s bombardment of Ukraine and threatened to launch more. “Ukraine has really increased the deep strikes against the oil facilities, because oil is something that is funding the war in Ukraine,” Kallas said. “We see at the same time that Putin is losing money, men, and momentum, and that’s why he’s increasing attacks on civilians.” The Russian leader has unleashed a series of ferocious drone and missile strikes against Ukraine in recent days, killing at least 23 people on Tuesday. “He’s clearly terrorising more to create fear, and because he’s on a back foot in the battlefield,” Kallas said. “But I think they haven’t been able to break the resilience of Ukrainians so far, and I doubt that they’re going to do this with these attacks.”