A Russian drone struck the central building of Ukraine's Security Service (SBU) on Volodymyrska Street in Kyiv on September 4, the first hit on the agency's headquarters since the 2022 invasion, wounding at least 12 people according to Mayor Vitali Klitschko, though earlier reports gave lower figures [3][4][5][25]. President Volodymyr Zelenskyy said the drone was aimed directly at the office of acting SBU chief Oleksandr Poklad, who was not present at the time, and that he instructed Poklad to prepare an "appropriate, tangible response and, where possible, one that mirrors this strike" [3][4][26]. The strike landed approximately 100 meters from the UNESCO World Heritage-listed St. Sophia Cathedral, damaging windows and elements of nearby historic buildings [25]. Foreign Minister Andrii Sybiha called the attack a major escalation launched during a renewed push for peace, saying it laid bare Moscow's rejection of diplomacy, and urged international partners to condemn the action and increase pressure on the Putin regime [3][7][25].
Ukrainian forces launched multiple drone waves against Sochi on September 3–4, including a naval drone strike on the Russian support vessel Nefrit and an apparent fire at an oil depot near the central port [10][11]. Ukraine's Navy identified Nefrit as part of Russia's maritime and energy infrastructure, and South Korea's Yonhap news agency described the strike as the longest-range naval drone attack to date, at approximately 560 kilometers [10][39]. Ukrainian drones also struck apartment buildings and a factory in Moscow Oblast, with Governor Andrey Vorobyev confirming fires but no casualties [11]. Russia's Defense Ministry said it shot down 490 Ukrainian fixed-wing drones over 19 regions, Crimea, and the Black Sea [24][42].
Ukrainian military and intelligence officials, corroborated by Western analysis, said the deep-strike and naval-drone campaign has degraded Russia's war economy. Ukraine's Foreign Intelligence Service reported that Russian oil exports from Novorossiysk fell from about 800,000 barrels per day in July to about 350,000 in August [1]. Zelenskyy said Russia's Black Sea Fleet is effectively blockaded in Novorossiysk, and Crimea's Russia-appointed Governor Sergei Aksyonov conceded that fuel supplies are not fully meeting residents' needs [1]. The Institute for the Study of War assessed that Russia's firm territorial gains over June–August fell roughly 90 percent below the same months of 2025 [1]. Ukraine's General Staff reported that Lukoil's NORSI refinery and the Novatek–Ust-Luga complex suspended operations after Ukrainian strikes [25].
Russian officials framed Ukraine as the aggressor in the deep-strike war. President Vladimir Putin accused Kyiv of opening "Pandora's box" with strikes on Russia's rear, a statement that preceded the Defense Ministry's announcement of a combined bombing campaign against Ukrainian energy infrastructure [8]. The Defense Ministry said its strikes targeted logistics centers, ports, vessels, and energy infrastructure linked to Ukraine's armed forces, including the EKO-Avtotechnics logistics center near Kyiv, ships in the Yuzhni and Chornomorsk ports, and the Novoodesskaya substation [8]. Odesa Governor Oleg Kiper said Russia massively attacked civilian infrastructure, killing one person and wounding at least five, including a child [8][31]. Russian authorities reported five killed and 14 wounded in Ukrainian attacks on the Belgorod region, including ambulance personnel [30].
Russia's increased use of faster jet-powered drones has been accompanied by higher Ukrainian civilian casualties. Air Force spokesman Yurii Ihnat said Russia launched about 2,800 jet-powered drones in August, nearly double July's figure, with an interception rate of only about 60 percent compared with over 90 percent for propeller-driven models [1]. MSF reported at least 51 people killed and nearly 100 injured in the Kyiv region between August 27 and September 3, and condemned strikes on civilian infrastructure, medical facilities, and residential areas [15]. The WHO said an overnight airstrike on September 3–4 hit one of its main medical-supply warehouses in Kyiv Oblast, the third attack on WHO storage in three months, and that warehouse locations are deconflicted and known to all parties [17][36]. MSF mental health supervisor Lesia Martseniuk said people are "getting more and more tired" as bridges close and metro stations go out of service [15].
Washington has asked both sides to suspend strikes while US envoys Steve Witkoff and Jared Kushner shuttle between Moscow and Kyiv carrying an end-the-war proposal [2][5]. Zelenskyy pledged Ukraine will conduct no airstrikes during the envoys' Moscow leg and called on Russia to reciprocate when they visit Kyiv [2][41]. Trump confirmed the envoys are bringing "a proposal to end the war" and "an idea for peace," while Kremlin spokesman Dmitri Peskow declined to confirm the visit's timing [5][16].
European governments linked a spate of sabotage incidents across the continent to Russia's coercive signalling. Polish Interior Minister Marcin Kierwiński said many signals indicate Russia is changing its strategy and intensifying sabotage activities, and Polish Prime Minister Donald Tusk called an attack on the WB Group drone producer a "continuation of Russia's escalatory activities" [21]. German Foreign Minister Johann Wadephul defended Berlin's closure of Russian consular and cultural facilities as a reaction to Russian behavior, while Russian Foreign Minister Sergey Lavrov announced the closure of Goethe-Institut offices in Russia [20][28]. Chatham House expert Keir Giles said Russia is "probing the boundaries of what's acceptable" and collecting information on what works [21].
US Treasury Secretary Scott Bessent attributed part of the global energy shock to Ukraine's strikes on Russian energy assets, saying they create "upward price pressure on a global basis" [18][35]. Bessent defended engaging Russia's finance minister at the G20, a stance more accommodating than a bipartisan Senate sanctions bill that would require the Trump administration to impose tougher sanctions on Russia [18].
Within Ukraine, Zelenskyy announced sanctions, an investigation, and the dismissal of deputy heads of both the SBU and the GUR after a shootout between their agents during a September 2 search in Kyiv exposed a long-standing rivalry [27]. Political analyst Volodymyr Fessenko ascribed the conflict to the personal confrontation between SBU chief Poklad and former GUR chief Kyrylo Budanov [27].
US envoys Witkoff and Kushner are expected in Moscow on September 5 and in Kyiv on September 6 [26][16]. The SBU has promised «еще больше специальных операций, раскрытых агентурных сетей и уничтоженных врагов» (even more special operations, exposed agent networks and destroyed enemies) in response to the headquarters strike, with Poklad reporting to Zelenskyy that the geography of retaliation is already determined and the timing will be chosen «so that the result is achieved» [26].