Quick Info
| Profession | Military communications expert, electronic warfare specialist and tech blogger |
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| Nationality | Ukrainian |
Latest News about Serhii Beskrestnov
Flash said that military Starlink service in Ukraine had been restricted at speeds above 160 kilometres per hour. He noted that no advance warning was given, which disrupted several missions.
Flash warned that Russia's Rassvet satellite network could enable real-time control of Shahed drones and other unmanned systems. He estimated that full coverage over Ukraine could arrive in about six months and called it the top technological threat Russia poses.
Flash stepped down as adviser to the Defence Minister after Mykhailo Fedorov announced he was leaving the ministry. He said it had been an honour to serve on Fedorov's team and that he would keep defending the country and helping soldiers.
Defence Minister Mykhailo Fedorov appointed Flash as an adviser on defence technology, citing his hands-on work on the front lines and his training of military personnel. His remit covered electronic warfare, captured enemy equipment, logistics analysis and countering Russian drones.
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Bio/Wiki
| Known as | Serhii "Flash" Beskrestnov, known by the callsign Flash |
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| Summary | Ukrainian radio and electronic warfare expert who writes publicly about drones, communications, electronic warfare and other battlefield technologies. In January 2026 he was appointed adviser to Defence Minister Mykhailo Fedorov on technology issues. He was injured in a Russian drone strike on his home outside Kyiv on 20/04/2026. He later left the defence ministry adviser post after Fedorov's departure from the ministry, saying he would keep supporting the military. Later reports from 2026 continue to describe him as a presidential technology adviser. |
Personal Life
| Home attack | His home outside Kyiv was destroyed in a Shahed-type drone strike on the night of 20/04/2026, and he was injured but survived. |
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Relationships & More
| Government role | Technology adviser to Defence Minister Mykhailo Fedorov (January 2026 until he stepped down after Fedorov left the ministry); later described in 2026 reports as an adviser on defence technology to the President |
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Career
| Military and volunteer work | Served as a former Ukrainian officer; since the start of the full-scale invasion has worked on the front lines and trained military personnel in electronic warfare systems and drone defence. |
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| Signal channel | Created a Signal channel where military communications specialists and civilian radio experts could exchange knowledge. |
| Public expertise | Was among the first to publicly report on Russia's use of FPV drones with machine vision and jet-powered Shahed drones. |
| Advisory role | Appointed in January 2026 as adviser on technological areas of defence, with a main focus on systemic solutions against Russian strike and reconnaissance drones. Stepped down from the post after Mykhailo Fedorov announced his departure as defence minister. |
Some Lesser Known Facts
| 1. He runs a popular Telegram channel titled Serhii Flash: Everything About Technology. | |
| 2. He is known for a homemade mobile radio intelligence vehicle used to monitor for nearby drones. | |
| 3. After the April 2026 strike he publicly posted a defiant message from hospital. |
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