Ukrainian forces appear to have repelled a Russian battalion-sized mechanized assault near Avdiivka, Donetsk Oblast, on March 30 — the first battalion-sized mechanized assault since Russian forces began the campaign to seize Avdiivka in late October 2023. A Ukrainian serviceman reported on March 31 that Russian forces, including elements of the Russian 6th Tank Regiment (90th Tank Division, Central Military District [CMD]), committed 36 tanks and 12 BMP infantry fighting vehicles (IFV) to a large-mechanized assault near Tonenke on March 30. Geolocated imagery published on March 31 shows a large number of destroyed and damaged Russian armored vehicles and tanks along a road northwest of Tonenke (west of Avdiivka). The Ukrainian serviceman stated that Ukrainian forces destroyed 12 Russian tanks and eight IFVs during the assault and noted that the frontal assault failed to breakthrough the Ukrainian line. This appears to be the first report of any elements of the 90th Tank Division participating in assaults following the Russian seizure of Avdiivka and ISW previously assessed that elements of the 90th Tank Division, alongside other Russian units and formations, likely represent a sizeable uncommitted operational reserve that the Russian military command can commit to continue and intensify efforts to push west of Avdiivka. The elements of the 6th Tank Regiment appear to have failed in their March 30 attack near Tonenke, however, suggesting that elements of Russia’s uncommitted operational reserve near Avdiivka may be too degraded or otherwise unable to lead further Russian advances westward in the short term.

The scale of the Russian mechanized assault on March 30 is significant. Russian forces have not conducted a mechanized assault this large since the beginning of the Russian localized offensive effort to seize Avdiivka in late October 2023, when Ukrainian forces reportedly destroyed almost 50 Russian tanks and over 100 armored vehicles on October 19-20, 2023. Ukraine’s ability to defend against the March 30 assault, particularly near Avdiivka where Ukrainian forces have been forced to quickly withdraw to new, defensive positions following the loss of the settlement, is a positive indicator for Ukraine’s ability to defend against future large-scale Russian assaults and the expected summer 2024 Russian offensive operation. Ukrainian officials, justifiably so, continue to warn about Ukraine’s ability to defend against the expected summer Russian offensive effort in the face of ammunition shortages, manpower limitations, and delayed Western assistance. Ukrainian forces may have had to expend a significant amount of material to defend against the Russian assault near Tonenke, highlighting Russia’s ability to conduct assaults that force Ukraine to expend outsized portions of its already limited material and manpower reserves to defend against. Ukraine’s demonstrated ability to skillfully defend against a large-scale Russian assault in a particularly critical part of the front despite Ukraine’s challenges suggests that Ukrainian forces can achieve significant battlefield effects if they are properly equipped.

The Russian command may be prioritizing the Avdiivka area in Donetsk Oblast. The Russian military command’s willingness to commit a battalion’s worth of tanks to an attack near Avdiivka indicates that this assault was a priority effort. The Russian command may focus their forecasted late spring/summer 2024 offensive operation on western Donetsk Oblast in hopes of building upon Russian forces’ steady but marginal advances in this sector. Ukrainian officials have recently warned that Russian forces are accumulating personnel along the Kharkiv-Luhansk axis, near Bakhmut, near Avdiivka, and in western Zaporizhia Oblast, but ISW continues to assess that Russian forces will likely only be able to launch a concerted large-scale offensive operation in one operational direction at a time due to Russia’s own manpower and planning limitations.