This paper aims to analyse the role of public intelligence as a strategic tool in modern conflicts, focusing on its use during the Russo-Ukrainian War. It employs a qualitative research design, combining comparative case analysis and document analysis to examine the role of public intelligence as a strategic tool in the Ukraine War. The primary data sources include declassified intelligence reports, official government statements, media coverage, and academic literature on intelligence disclosure and strategic communication. The findings of this study indicate that public intelligence disclosure in the Ukraine War has been highly effective in countering Russian disinformation and strengthening diplomatic cohesion among Western allies. Unlike previous conflicts, intelligence transparency played a crucial role in shaping global narratives and mobilising international support. However, its deterrence value remains uncertain, as intelligence disclosures did not prevent Russia’s full-scale invasion. The findings of this paper highlight how intelligence dissemination has shifted from classified circles to a public tool of strategic statecraft. The Ukraine War marked a departure from traditional intelligence practices, as the U.S. and U.K. used real-time declassification to counter Russian disinformation, unify allies, and shape global opinion. This shift underscores both opportunities and limitations, as intelligence transparency did not deter Russia’s invasion. Public intelligence disclosures proved effective in neutralising misinformation and influencing diplomatic responses. Intelligence disclosure also had diplomatic ramifications. While it helped rally allies, initial scepticism from Germany and France revealed lingering distrust due to past intelligence failures.