Ukrainian military officials report they have stopped a large-scale Russian offensive targeting the Sumy region in northeastern Ukraine. This area borders Russia’s Kursk region, where Ukraine launched a cross-border raid in August 2024. While Russia claims its advance is inevitable, Ukraine asserts its forces have stabilized the front line and are conducting counter-offensive measures. The fighting in Sumy is characterized by significant troop deployments and evolving tactics, including widespread drone use and technological countermeasures.
Contents
Key Takeaways:
- Ukraine’s General Staff claims the Russian offensive in Sumy has been halted, despite Russia deploying tens of thousands of troops.
- Fighting continues intensely, with both sides using elite units and facing significant costs.
- Recent developments include large Russian aerial attacks, casualties, technological adaptations in drone warfare, and claimed cyberattacks targeting Russian electronic warfare systems.
Russian Offensive in Sumy: Claims and Counterclaims
According to Ukraine’s Armed Forces General Staff, Russia has committed around 50,000 troops to the offensive aimed at the Sumy region. However, they state that the advance has been stopped along a specific line including Junakivka, Yablunivka, Novomikolaivka, Oleksiyivka, and Kindrativka, extending into Russia’s Kursk region. Ukrainian forces reportedly maintain defenses and are preparing counter-offensive actions. The General Staff also claimed Ukrainian troops “liberated” the village of Andriyivka and advanced near Oleksíivka.
General Oleksandr Syrskyi, Ukraine’s Commander-in-Chief, stated that the Russian goal is to “wear us down with their numbers.” Ukrainian military intelligence (GUR) units were deployed to help stabilize the situation in Sumy earlier in the month, according to reports. Russia has reportedly sent some of its most experienced units, including airborne and naval infantry brigades, into the fight in Sumy.
Lieutenant General Kyrylo Budanov, head of Ukraine’s GUR, indicated that Russia’s objective is to create a buffer zone within Ukrainian territory. While acknowledging some Russian advance, Budanov described the Ukrainian resistance as “crazy” and stated the advance lacked strategic significance.
Meanwhile, Russian sources present a different picture. The Russian Ministry of Defense claimed that units improved their tactical situation in Sumy, inflicting losses on multiple Ukrainian brigades and regiments near various settlements. Russian military bloggers asserted that despite Ukrainian efforts, further Russian advance in the region is “inevitable.” Russian artillery fire has also reportedly reached deeper into the Sumy region, increasing risks for towns and villages near the front lines.
Holding the line in Sumy is reportedly coming at a high cost for Ukraine. Soldiers who fought in the previous operation in Russia’s Kursk region noted a lack of prepared defensive positions on the Ukrainian side of the border after retreating. They described outdated trenches lacking overhead cover and areas without minefields, forcing troops to dig in under fire.
Ukrainian President Volodymyr Zelenskyy warned that Russia is preparing for new offensives and not seeking an end to the conflict.
Situation on Other Fronts
According to assessments from the Institute for the Study of War (ISW), front lines elsewhere remained largely static around late June 2025.
- Kursk: Fighting continued with no significant gains for either side.
- Kharkiv: Russian forces maintained offensive operations but without confirmed advances.
- Luhansk: Russian troops attempted to advance toward key areas but did not gain territory.
- Donetsk: Russian forces conducted offensive operations in several directions without confirmed advances, while Ukrainian forces made a limited advance near Chasiv Yar.
- Zaporizhzhia: Offensive operations continued near Malynivka and in the western part of the region but did not result in advances.
- Kherson: No ground activity was reported by either side.
Air and Drone Warfare Developments
Over a recent weekend, Russia reportedly launched the largest aerial attack of the war, involving 477 drones and 60 missiles. The Ukrainian Air Force claimed to have shot down 249 of these, while 226 were lost, likely due to electronic jamming. The attack resulted in at least 10 civilian deaths. A Ukrainian F-16 pilot, Maksym Ustymenko, was killed while defending against the attack after successfully shooting down seven targets before his aircraft was damaged. This marks at least the fourth confirmed loss of a Ukrainian F-16 pilot.
Beyond fighter jets, Ukraine is also utilizing helicopters, such as the Mi-24 Hind, to intercept Russian attack drones, demonstrating diverse aerial defense tactics.
In the naval domain, there were claims that Russia is using Kh-31 supersonic anti-ship missiles, launched from Su-30 fighters, to target Ukrainian drone boats. This tactic would allow Russian aircraft to engage from safer distances. However, Ukraine’s GUR head Kyrylo Budanov dismissed these claims, stating he had no information of such attacks and calling the tactic “stupid and ineffective” for engaging small, fast targets like drone boats, which are usually targeted with cluster bombs.
Video thumbnail potentially showing naval drone activity or missile engagement.
Unconfirmed reports suggest Ukraine may be using heavy industrial quadcopter drones, nicknamed “Baba Yagas,” to drop artillery shells on Russian positions. Footage shared by Ukrainian military bloggers appears to show these drones dropping 155mm and 122mm shells. While challenging to verify independently, heavy-lift drones are technically capable of carrying such munitions. Using drones for shell delivery could offer increased accuracy and reduce wear on artillery barrels compared to traditional howitzers.
Technological Warfare and Countermeasures
Ukraine’s Metinvest company announced it has developed new armor protection specifically for Patriot air defense systems, a critical asset often targeted by Russia. The three-ton steel frame and armor plate structure is designed to shield key components like the control station, radar, and generator, aiming to increase the system’s survivability under fire. This follows previous efforts by Metinvest to develop armor kits for Western-donated air defense systems.
Ukrainian drones continue to target high-value Russian air defense systems in Crimea. Recent footage shows a swarm of Ukrainian drones targeting S-400 batteries, hitting components including TELs (Transporter Erector Launchers) and radar systems. Such attacks aim to create gaps in Russia’s air defense network over the peninsula and the Black Sea, potentially improving the survivability of Ukrainian strike weapons and drones.
Ukraine also released the first public footage of the launch of a kamikaze drone based on the Aeroprakt A-22 light aircraft. These converted aircraft have been used in past attacks on Russian targets, including a claimed strike on a Shahed drone factory.
The effectiveness of First-Person View (FPV) drones remains a subject of discussion. A foreign fighter who served in Ukraine offered a critical assessment, arguing that FPV drones are often inefficient, technically unreliable, and vulnerable to interference and environmental conditions. He suggested alternative, cheaper munitions like mortar shells might be more cost-effective for some tasks. This perspective contrasts with broader observations that FPV drones have significantly impacted the battlefield by striking targets at low cost and pinning down forces.
A video circulated showing an FPV drone impacting a vehicle without causing significant damage, highlighting potential limitations depending on the drone and target.
On the other side, a Russian military blogger shared advice on surviving Ukrainian surveillance drones, particularly smaller models like the Mavic. Tips included avoiding congregating in groups visible to thermal imagers, while dismissing playing dead or hiding in trash as ineffective against thermal detection.
Thermal footage also continues to emerge showing the effectiveness of FPV drones against personnel.
In the realm of electronic warfare (EW), the pro-Ukrainian Russia Volunteer Corps (RDK) claimed to have obtained significant data on Russian strategic EW systems through hacking. The group alleged this data reveals serious flaws in Russian systems, such as sensitivity to weather, vibrations, and poor performance in combat conditions, potentially allowing Ukraine to better target these assets.
Video thumbnail related to claimed hack of Russian electronic warfare system data.
Finally, images on social media show Russia adapting naval equipment for ground use, specifically deploying AK-630 naval anti-aircraft guns as fixed firing positions in occupied southern regions. These rapid-fire 30mm guns are being removed from ships for this purpose.
Conclusion
The conflict in Ukraine continues to evolve, with focus currently on the intense fighting in the Sumy region where Ukraine claims to have stalled a major Russian push. While front lines elsewhere remain largely static, both sides are employing and adapting technology, particularly drones and electronic warfare, alongside conventional combat. The human and material costs remain significant, and Ukrainian officials warn that Russia is preparing for further offensives.
For more context on specific developments, explore related articles on:
- The August 2024 cross-border raid into Russia’s Kursk region.
- Reports on the use of AIM-9X missiles from Ukrainian drone boats.
- Analysis of Ukraine’s fiber optic drone warfare.
- Previous instances of armor kits on Western air defense systems in Ukraine.
- Prior attacks on Russian air defenses in Crimea.
- Earlier attacks on Russian targets using converted light aircraft drones.
