Ukraine's Military Intelligence Service (HUR) executed a targeted cyber operation against Tupolev, a major Russian aerospace and defense firm, resulting in the exfiltration of over 4.4 GB of classified data. The breach compromised real-time internal communications among senior leadership, including procurement records, closed-door meeting protocols, and confidential resumes of engineers and designers. Additionally, staff members' personal data was exposed, alongside operational details of Russia’s strategic aviation programs. The attack also led to the defacement of Tupolev’s official website, signaling a deliberate act of disruption. HUR’s operation is part of a broader campaign targeting Russian military logistics, weapons manufacturers, and aviation entities. The stolen data eliminates operational secrecy for Tupolev, granting Ukrainian intelligence unprecedented visibility into Russia’s aerospace capabilities, personnel, and supply chains. The breach undermines Tupolev’s strategic integrity, with long-term implications for Russia’s defense infrastructure and national security.