This article examines how the identity of the citizens or ‘the people’ of Russia is constructed in the wartime speeches of Ukrainian president Volodymyr Zelensky. Drawing on a discursive approach to populism using post-foundational discourse analysis (PDA), the article first identifies in Zelensky's eve-of-invasion address an antiwar transnational populist construction of a common antiwar interest of ‘ordinary people’ in Russia and Ukraine against the Russian government's overtures towards war. After the full-scale invasion, this construction initially carried over into Zelensky's appeals to ordinary Russians as being under threat from and capable of resisting their own government, before his messaging shifted towards ascribing collective responsibility for the invasion to Russian citizens, following the revelation of the Bucha war crimes. Ultimately, antiwar transnational populism remained a short-lived and contextually bounded phenomenon, limited to an initial phase until early April and briefly resurfacing in Zelensky's appeal to ‘indigenous peoples’ of the Caucasus and Siberia in late September 2022.