Valery Gerasimov said in remarks released by the defense ministry that Russian forces had taken control of 80 settlements and were pushing toward what he described as Ukraine’s “fortress belt” in the east.

The campaign is focused on the Donbas, where Russian troops are advancing toward a line of heavily defended cities, including Sloviansk, Kramatorsk and Kostiantynivka. Gerasimov said Russian forces were within 7 to 12 kilometres of Sloviansk and Kramatorsk and already engaged in fighting in parts of Kostiantynivka.

Russia is also conducting operations in the northern Sumy region and the northeastern Kharkiv region, aiming to establish what it calls a “security zone” along the border.Reuters could not independently verify the battlefield claims, and Ukraine’s military did not immediately comment.

Pro-Ukrainian mapping suggests a smaller territorial gain by Russian forces this year.Ukrainian commander Oleksandr Syrskyi said earlier this month that Kyiv’s troops had recaptured nearly 50 square kilometres in March, highlighting continued contested advances in what is Europe’s deadliest conflict since World War II.

According to Russian estimates, Moscow controls about 90% of Donbas and roughly 75% of the Zaporizhzhia region and Kherson region, along with smaller parts of other regions including Mykolaiv region and Dnipropetrovsk region.

Russia also retains control of Crimea, which it annexed in 2014, a move widely rejected internationally.The conflict, which began with Russia’s full-scale invasion in 2022, continues to see incremental territorial shifts, with both sides reporting gains amid heavy fighting.