Russia's Spring Offensive Intensifies Along Sloviansk-Kramatorsk Axis; Kupyansk Salient Under Pressure

Russia's spring-summer 2026 offensive continues to develop on multiple axes as of March 30. Following the capture of Kovsharovka on March 29, Russian 'West' Group is pressing toward Kupyansk-Uzlovoi, threatening Ukrainian supply lines north of Sloviansk. The 'South' Group is advancing on the Sloviansk axis via Nikiforovka, preparing an assault on the Slavyansk–Kramatorsk–Druzhkovka–Konstantinovka urban agglomeration — Ukraine's fortified 'Fortress Belt.' In Zaporizhzhia, Russian pressure near Huliaipole continues with heavy bombardment. Russian forces control approximately 20% of Ukraine (~45,783 sq mi including pre-2022 Crimea and Donbas holdings). ISW assesses the Fortress Belt is unlikely to fall in 2026 given high attrition costs, but Russia appears willing to absorb heavy losses to advance frontlines before any ceasefire could freeze positions.