While Ukraine's Operation Vivaldi has seized the headlines further north, the largest battle of the war is now being fought around Dobropillia in western Donetsk region, where Russia has concentrated four armies along a 50-kilometre front in an attempt to break through toward Kramatorsk. Weeks of massed assaults have gained Moscow only a precarious foothold south of the city, and Ukraine's 1st Azov Corps says Dobropillia itself remains firmly under Ukrainian control.
The stakes are straightforward. Dobropillia sits on the western approaches to Ukraine's fortress belt in the Donbas. If Russian forces take it, they can advance west of Kramatorsk, one of the main Ukrainian-held cities in the region, and begin unravelling the defensive line that has held since 2014. That is why, after rolling back the northern pincer of Russia's planned encirclement of Sloviansk and Kramatorsk last month, Ukrainian commanders now describe Dobropillia — not Lyman — as the place where Russia is currently advancing.
Four armies on a 50-kilometre front
Military analyst Clement Molin has called the fight for Dobropillia the biggest ongoing battle of the war, a scale he says has rarely been seen before. Russian forces are sending hundreds of men into assaults every day, supported by a massive number of drones and KAB guided bombs, and hundreds are being eliminated while the 1st Azov Corps still manages to contain the offensive.
The effort has produced results, but at a frightful cost in men and materiel. In recent weeks Russian forces, mainly the 51st Army, have advanced south of Dobropillia and secured a foothold north and west of the Ukrainian defensive line, threatening the city from the south. Further north, the 41st Army has made little progress despite repeated infiltrations, and Ukrainian counterattacks have cleared some of the areas its troops slipped into. The neighbouring Druzhkivka front has been partially stabilised; Dobropillia has not.
The offensive is not new. Russian troops opened their renewed push on 22 July with a rare large-scale mechanised assault southeast of the city — the first of its kind in over a year — which Ukrainian forces repelled, destroying nine tanks, two armoured vehicles and three Grad rocket systems. Since then Moscow has fed in armour, quad bikes and motorcycle assault groups, and in late August Kyiv reinforced the sector, putting Azov commander Brigadier General Denys "Redis" Prokopenko in charge of Ukrainian positions around Dobropillia.
Azov's defence and the infiltration war
The 1st Azov Corps, built around the 12th Special Forces Brigade Azov and commanded by Prokopenko, is explicit about what Russia intends this autumn: the encirclement of Dobropillia. For now, the corps says, that remains only in Moscow's plans and in the false reports of Russian commanders.
Russian assault groups are being identified and destroyed on the approaches to the city as they try to infiltrate between Ukrainian positions, the corps says — a pattern that has come to define this battle. Rather than massed breakthroughs, Russia increasingly relies on small groups seeping through gaps, forcing Ukrainian units into constant search-and-destroy and counter-sabotage work to stop infiltration from becoming a systemic threat to the city's defence.
A claim of encirclement that does not match the map
On 22 September the Russian Defence Ministry reported that its troops had surrounded Ukrainian forces inside Dobropillia, publishing a map two days later to support the claim. The alleged encirclement was not backed by any geolocated evidence. The Institute for the Study of War assessed the claim as false, finding the closest Russian positions about 10 kilometres from Dobropillia, and the 1st Azov Corps responded that its forces remain in control of the city.
That gap between claim and map matters, because it is the same pattern seen in Moscow's September figures for the whole front: large announced gains that independent, geolocated assessment does not confirm. What is real at Dobropillia is not an encirclement but attrition — a Russian army willing to spend hundreds of soldiers a day for a foothold, against a Ukrainian corps that is trading space slowly while keeping the city itself.
Dobropillia will not decide the war this week. But as winter approaches, it is where Russia is spending its reserves — and where Ukraine, for now, is still holding.
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