Russia's Donbas Offensive Has Failed To Make Significant Gains, Will Culminate Soon

Despite having mounted an intensive offensive in Donbas for over a year, Russia does not have sufficient manpower or materiel to make 'operationally significant' breakthroughs in the face of Ukraine's effective defense in depth. 

Russian forces are therefore attempting to achieve more limited objectives, though have continued to fail to make strategic gains. As a result, it is conceivable that the current Donbas offensive will have to culminate soon, which is why some Russian attacks have intensified recently, though without notable outcomes. JL

The Institute for the Study of War reports:

Operationally significant gains will continue to elude the Russian offensive in eastern Ukraine that began in fall 2023. Ukrainian forces are conducting an effective defense in depth along the frontline, inflicting significant losses upon Russian forces while slowly giving ground but preventing the Russian military from making more rapid gains on the battlefield. Russian offensive operations pursuing operationally significant objectives, like the Russian effort to seize Chasiv Yar have stalled. Russian forces have tried and failed to conduct wide operational maneuver across several axes throughout Donetsk Oblast  and are currently conducting intensified offensive operations in pursuit of more limited objectives, Russian forces do not have the available manpower and materiel to continue intensified offensive efforts indefinitely and current Russian offensive operations in eastern Ukraine will likely culminate in the coming months, if not weeks

The Russian offensive effort in eastern Ukraine that began in fall 2023 continues to produce gradual Russian tactical gains in specific sectors of the front, but operationally significant gains will likely continue to elude Russian forces. Ukrainian forces are conducting an effective defense in depth along the frontline, inflicting significant losses upon Russian forces while slowly giving ground but preventing the Russian military from making more rapid gains on the battlefield. Ukrainian forces do face serious operational challenges and constraints, which are providing Russian forces with opportunities to pursue tactically significant gains. Russian forces do not have the available manpower and materiel to continue intensified offensive efforts indefinitely, however, and current Russian offensive operations in eastern Ukraine will likely culminate in the coming months, if not weeks, as Ukrainian officials and ISW have previously assessed.

Russian forces have recently made notable tactical gains but have not demonstrated a capacity to seize operationally significant objectives. ISW distinguishes between tactical gains, which are relevant at the tactical level of war in the near vicinity of the fighting, and operational gains, which are significant at the operational level of war and affect large sectors of the entire frontline. Russian forces seized Vuhledar in western Donetsk Oblast as of October 1, and the settlement will likely afford Russian forces an improved tactical position for pursuing their operational effort to advance towards the H-15 (Donetsk City–Zaporizhzhia City) highway and eliminate the wide Ukrainian salient in western Donetsk Oblast.[1] The Russian seizure of Vuhledar will not on its own radically change the operational situation in western Donetsk Oblast, however, and Russian forces will likely struggle to achieve their operational objectives in the area during the ongoing offensive operation in western Donetsk Oblast.[2] Russian offensive operations that are pursuing operationally significant objectives, like the Russian effort to seize Chasiv Yar or to push Ukrainian forces off the left (east) bank of the Oskil River, have either stalled or are resulting in particularly gradual gains over long stretches of time, respectively.[3] Russian forces continue to prioritize their offensive push towards Pokrovsk, and the operational significance of seizing the city will likely in part depend on the Russian military's ability to leverage the city in wider operational maneuver in Donetsk Oblast.[4] Russian forces have tried and failed to conduct wide operational maneuver across several axes throughout Donetsk Oblast on several occasions during the full-scale invasion and are currently conducting intensified offensive operations in pursuit of more limited objectives on only two mutually supporting sectors of the frontline in Donetsk Oblast (western Donetsk Oblast and the Pokrovsk direction).[5]

The Russian military command prepared the ongoing Russian summer 2024 offensive operation for months in advance and accumulated operational reserves and resources for the operation that the recent months of attritional fighting have likely heavily degraded. Russian forces reportedly aimed to establish a new operational grouping of forces with uncommitted operational reserves of up to 70,000 personnel for the offensive operation into northern Kharkiv Oblast in May 2024 while also establishing operational reserves for the Central Grouping of Forces' push to Pokrovsk this summer.[6] Russian forces have likely expended a good portion of these reserves on the stalling offensive operation into northern Kharkiv Oblast, the intensified offensive tempo in the Pokrovsk direction and western Donetsk Oblast, and the response to the Ukrainian incursion into Kursk Oblast.[7] Russian forces also continue to suffer heavy armored vehicle losses in large, unsuccessful mechanized assaults throughout the frontline, particularly in western Donetsk Oblast.[8] Russian forces likely accumulated a large amount of equipment for such mechanized assaults, but significant medium- to long-term constraints on Russian armored vehicle stocks will become more salient as losses grow and may force the Russian military command to rethink the benefit of continuing such intensified mechanized activity in Ukraine.[9] Continued heavy Russian attrition in Donetsk Oblast and further Russian redeployments to Kursk Oblast will weaken Russia's ability to sustain offensive operations in northeastern and eastern Ukraine, although Russian forces are more likely to continue decreasing offensive activity on lower-priority sectors of the front than to do so equally along the entire frontline.[10] The current Russian summer 2024 offensive operation will likely culminate in the coming weeks and months, but Russian forces may nevertheless continue to conduct offensive operations at a much lower tempo throughout Ukraine in hopes that consistent offensive pressure would prevent Ukrainian forces from accumulating the manpower and resources needed to contest the theater-wide initiative.[11]

Russian forces have reportedly committed a significant portion of their intended operational reserves to offensive operations in Donetsk and northern Kharkiv oblasts, indicating that the Russian military command may have prioritized forming operational reserves to support offensive operations in priority sectors of the frontline over developing theater-wide strategic reserves for the entire offensive campaign in Ukraine. Ukrainian military observer Kostyantyn Mashovets stated on October 3 that the Russian military command originally intended to commit most of Russia's "strategic reserves" to the Kharkiv and Pokrovsk-Toretsk directions, but that the Ukrainian incursion into Kursk Oblast and slowing Russian advances in northern Kharkiv Oblast complicated this plan.[12] Mashovets noted that the creation of the Russian Northern Grouping of Forces and the reinforcement of the Central Military District [CMD] in the Toretsk, Pokrovsk, and Kurakhove directions throughout 2024 comprised most of Russia's efforts to develop "strategic reserves." Mashovets noted that within the Leningrad Military District [LMD] Russian forces have established the newly-formed 69th Motorized Rifle Division and another unspecified motorized rifle division (both part of the 6th Combined Arms Army [CAA], the 44th Army Corps (AC) and its 72nd Motorized Rifle Division and another unspecified motorized rifle brigade, and are continuing to staff the 68th Motorized Rifle Division (6th CAA) and the 71st Motorized Rifle Division (14th AC).[13] Mashovets stated that Russian forces also established the 51st and 3rd CAAs and the 27th Motorized Rifle Division (2nd CAA) under the CMD in 2024. Mashovets noted that the Russian military command has already introduced some of these units and formations into combat below their doctrinal end strength and may introduce other formations as understrength "combined-reduced divisional tactical groups" in the near future.[14]

ISW has recently observed confirmation that some of these formations have been deployed to the Kharkiv and Pokrovsk directions. Ukraine's Kharkiv Group of Forces recently reported that the Russian military deployed elements of the 69th Motorized Rifle Division near Vovchansk, Kharkiv Oblast.[15] Russian milbloggers claimed that elements of the Russian 72nd Motorized Rifle Division are also operating in northern Kharkiv Oblast.[16] The Russian military command has reportedly deployed elements of the 68th Motorized Rifle Division to northern Kharkiv Oblast as well, and Mashovets recently stated that the Russian military command intends to deploy the remainder of the understrength division to the frontline in northern Kharkiv Oblast between the end of October and the beginning of November 2024.[17] Elements of the Russian 27th Motorized Rifle Division are reportedly operating southeast of Pokrovsk.[18] ISW has not observed reports of elements of the 71st Motorized Rifle Division participating in offensive operations in Ukraine, however. Mashovets' report likely does not encompass all of the reserve units and formations that Russia recently formed or is currently forming, although it is notable that Russia has already introduced elements of most of these formations to combat.

The Russian military command is continuing to prioritize offensive operations in priority sectors of the frontline over long-term planning for Russia's theater-wide campaign in Ukraine, but the Ukrainian incursion into Kursk Oblast appears to have significantly complicated the development of Russia's operational reserves. The Russian military command's reported intention for these reserves to participate in a specific priority of the sector instead of being committable throughout the theater indicates that these are "operational" and not "strategic" level reserves. Unspecified US officials told the New York Times (NYT) in August 2024 that Russia likely needs to deploy 15 to 20 brigades — at least 50,000 troops — from Ukraine or Russia's operational reserves to push Ukrainian forces out of Kursk Oblast.[19] The Russian military command will likely continue to grapple with the impacts of manpower constraints on Russia's offensive capabilities until Russian President Vladimir Putin decides that the benefits of more effective force-generation policies, such as another partial mobilization call up of Russian reservists, outweigh the risk of societal backlash.