The day began with reports of Ukrainian strikes deep inside Russia, including the Sheskharis oil terminal in Novorossiysk, a tanker, and a chemical plant in Perm Krai, confirmed by Zelensky. By midday, the General Staff detailed hits on Russian oil infrastructure and a train with ammunition. In the afternoon, the narrative shifted sharply as Zelensky warned that Russia may be preparing an Oreshnik missile strike on Ukraine, potentially targeting Kyiv. The US Embassy in Kyiv then issued a warning of a major attack within 24 hours. Air raid alerts sounded in Kyiv and several regions in the evening. Meanwhile, bipartisan US senators urged the Pentagon to accelerate aid to Ukraine, and the government announced new mobilization rules effective June 1.