Russia has launched a buffer-zone operation into Sumy and Kharkiv oblasts. Chief of the General Staff Valery Gerasimov stated that President Putin ordered the push to protect Russia's Kursk and Belgorod oblasts from Ukrainian cross-border raids1. The framing is defensive — protect Russian border regions — but the method is offensive: advancing into another state's sovereign territory and holding ground.
The order is a direct consequence of Ukraine's Kursk incursion of August 2024, when Ukrainian forces crossed into Russian territory, seized several hundred square kilometres, and held them for months before being pushed back in a costly Russian counter-operation that reportedly drew on North Korean infantry reinforcements. That incursion humiliated Russia's border defence establishment and proved Ukraine could project force across the international boundary. Moscow's response is to push the security perimeter forward into Ukrainian territory rather than reinforce its own side of the border — a strategy with precedents in Turkey's operations in northern Syria since 2016 and Israel's in southern Lebanon. The logic in each case is identical: deny the adversary staging ground by occupying it.
This is Russia's second attempt to operate in northern Kharkiv Oblast. In May 2024, Russian forces pushed into the Vovchansk area and stalled within weeks, unable to establish fire control over resupply routes against concentrated Ukrainian defences. The current operation spans two oblasts simultaneously, which suggests a larger force commitment — but also means more ground to hold with troops already committed across a 1,000 km front line. Every battalion deployed to the northern buffer zone is one unavailable for the Donetsk axis, where Russian forces are advancing toward Kostiantynivka and attempting to encircle Kramatorsk and Sloviansk.
For Ukraine, the dilemma is resource allocation. Defending Sumy and Kharkiv requires forces that might otherwise reinforce the east or sustain the southern counter-offensive that reclaimed 300–400 sq km in February. For civilians, the buffer-zone push brings ground combat closer to population centres that have so far experienced aerial bombardment but not occupation. Kharkiv city, Ukraine's second largest with a pre-war population of 1.4 million, sits roughly 40 km from the Russian border — within standard artillery range of any force operating in northern Kharkiv Oblast. The 3.7 million internally displaced Ukrainians already inside the country include hundreds of thousands from these oblasts; a sustained ground operation would generate further displacement into an already strained system.
