Executive Summary
- Russian forces pushed deeper into Ukrainian lines near Kostiantynivka, one of Ukraine’s most heavily fortified defensive zones.
- Following mounting domestic criticism over the military’s inability to prevent long-range Ukrainian drone strikes, the Kremlin appointed Aleksandr Chayko, a general implicated in the 2022 massacre of Ukrainian civilians in Bucha, to head the Russian Aerospace Forces.
1. Battlefield Update
The battlefield geometry did not change drastically last week—apart from the front lines near Kostiantynivka, where Russian forces are mounting an aggressive push. Pokrovsk continued to be the focal point of combat activity elsewhere. Sloviansk, Huliaipole, and Lyman also remained important flashpoints.
Open-source battlefield assessments and a month-long review of publicly available geolocated combat footage reveal intensifying Russian pressure around Kostiantynivka, one of the most active sectors of the war. Russian forces are gradually advancing toward the city along multiple axes in an effort to secure a foothold near one of Ukraine’s most heavily fortified defensive zones. Russian infiltration elements have reportedly sustained heavy casualties, but multiple visual sources suggest that small assault groups continue penetrating toward the central parts of the city.
Kostiantynivka constitutes one part of the broader eastern Ukrainian “fortress belt,” a layered defensive network designed to slow and attrit Russian offensive operations across Donbas. Several defensive positions on the southeastern edge of the city are becoming “grey zones,” contested areas where neither side exercises full control.
Russian territorial gains north of Kostiantynivka also continued to shape the operational picture in the region. Moscow claimed control of Novodmytrivka earlier this week, while the chief of the General Staff of the Russian Armed Forces, Valery Gerasimov, stated that Russian troops were simultaneously advancing north and south of Kostiantynivka. The evolving battlespace suggests that Moscow is attempting to compress Ukraine’s defenses through incremental infiltration tactics and sustained attritional pressure rather than through rapid maneuver warfare.
Long-range strikes also continued to shape the character of the conflict. Beginning on the morning of May 4, Russian forces launched a coordinated long-range salvo employing Iskander ballistic missiles and scores of loitering munitions. Against these strikes, Kyiv relied on a layered defensive architecture, combining tactical aviation, surface-to-air missile units, electronic warfare assets, unmanned systems formations, and mobile fire groups. Ukrainian air defenses intercepted 70 drones, though at least one missile and more than 10 drones penetrated these defenses and struck their designated targets.
Russian forces also intensified their pressure on Ukraine’s energy-support infrastructure. Over the past week, Russian strikes hit 11 fuel stations across Kharkiv, with most attacks targeting gas-storage and fuel-distribution facilities.
Finally, on May 3, Russia conducted another large-scale wave of strikes against Ukraine using a mixed package of missiles and attack drones. Russian long-range fires again targeted civil infrastructure and residential districts, underscoring Moscow’s continued pressure campaign against Ukraine’s urban rear areas and critical support networks.
2. Putin Appoints the Butcher of Bucha as the New Chief of Russia’s Aerospace Forces
Russian President Vladimir Putin reportedly fired the commander of the Russian Aerospace Forces following mounting criticism over the military’s inability to prevent large-scale Ukrainian drone strikes against critical infrastructure targets deep inside Russia. Putin named Colonel General Aleksandr Chayko to replace General Viktor Afzalov, who had led the Aerospace Forces since 2023.
Chayko, a career ground-forces officer—not an aerospace commander—led Russian operations in Syria and had commanded the Eastern Military District since 2021. His appointment mirrors Moscow’s broader wartime pattern of elevating hardline combat commanders with battlefield experience rather than technocrats with aerospace expertise.
Chayko brings substantial baggage to his new position. Ukrainian authorities indicted Chayko, known in Ukraine as the Butcher of Bucha, for his role in Russia’s failed offensive on Kyiv in 2022. The European Union also imposed personal sanctions against Chayko in March 2026 over allegations tied to Russian military operations around Bucha, where Russia massacred hundreds of Ukrainian civilians during the opening phase of the war.
The leadership change follows a series of increasingly damaging Ukrainian drone attacks against Russia’s energy and export infrastructure. In late March, drones disrupted operations at key Russian oil ports on the Baltic Sea, temporarily affecting the country’s exports. Throughout April, Ukrainian long-range drone operations also reportedly struck Russian refining infrastructure more than 20 times. These attacks hit at least nine refineries, five of which suspended production. Furthermore, Ukraine attacked Russia’s strategic energy hub at Tuapse four separate times, reportedly causing major petroleum fires, fuel oil leaks, and environmental contamination.
3. What to Monitor in the Coming Weeks
Ukraine will seek to stabilize the Kostiantynivka front before the Armed Forces of the Russian Federation can capitalize on last week’s success. Heavy fighting will almost certainly rage in this sector in the coming weeks.