Ukraine's Operation Vivaldi pushes back Russian forces in Donbas

Ukraine's 3rd Army Corps conducted a secret counteroffensive, Operation Vivaldi, in May 2026, improving defensive positions around Lyman and Sviatohirsk and disrupting Russian encirclement plans for Sloviansk and Kramatorsk. The operation's success is reported by Ukrainian sources, with details still emerging. This shift in momentum could affect the broader Donbas front.

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