U.S. experts have joined a Ukrainian investigation into the crash of an F-16 fighter jet, which occurred during a major Russian missile and drone attack on August 26, resulting in the death of pilot Oleksii Mes. Ukrainian Air Force Commander Mykola Oleshchuk announced that a detailed analysis is underway to determine the circumstances of the crash, with preliminary reports suggesting it was not caused by Russian fire but possibly by pilot error or mechanical failure. Concurrently, a Russian attack on Kharkiv killed at least five individuals, including a 14-year-old girl, and injured numerous others, prompting President Zelensky to urge Western partners to lift restrictions on Ukrainian military capabilities. The F-16s, recently delivered to Ukraine, could potentially target Russian military bases further from the front lines. Oleshchuk emphasized the importance of transparency in the investigation, although he noted that details would remain classified for security reasons. The incident raises ongoing concerns about the effectiveness of Ukraine's air defenses amid escalating hostilities.