Here is a concise original summary based on the information published by the source. Ukraine's Zelenskiy says intelligence shows Russia is preparing massive attack ReutersRussian Offensive Campaign Assessment, October 4, 2026 Institute for the Study of WarUkraine claims its strikes have taken out more than half of Russia's oil refining capacity PBSZelensky Warns Ukrainians of Massive Russian Strike as 3 Tu-160 Strategic Bombers Take Off From Siberia Kyiv PostRussia ramps up attacks on Kyiv infrastructure as U.S. makes fresh push for peace talks CNBC For the full context and any later updates, use the original source link.