The dataset contains plant occurrence records from Ukraine that were previously published in selected, author-verified online sources. This information is crucial for assessing the impacts of the Russian-Ukrainian war and therefore primarily includes plant data from Ukraine’s steppe zone, which since 2022 has been almost entirely affected by military operations or has fallen under occupation. Scientific research in this area has ceased, and the territory has suffered extensive destruction due to shelling, airstrikes, construction of fortifications, and wildfires. In addition, invasive plant species have begun to spread spontaneously throughout the region. All previously collected biodiversity information from these territories has now become historical and can be used in the future to assess the consequences of the war. There is also an urgent need to preserve the data themselves. Some authors, including those who previously maintained personal websites with photographs and insect collections, have stopped working in these areas and have left the occupied part of Ukraine. The online sources used to compile this dataset are not represented in GBIF. Moreover, there is reason to believe that such sources may cease to exist in the near future, which would result in the permanent loss of important data. Thus, the dataset provides a detailed overview of information that was previously published in individual online sources and concerns the territory of Ukraine.