Russia Uses Low-Cost, Jam-Proof Drones to Strike High-Value Ukrainian Power Substations

Russia is successfully using small, low-cost drones guided by fiber-optic cables to evade Ukrainian defenses and damage high-voltage electricity substations, according to open-source analysis. The new tactic, observed in the frontline Sumy region, allows drones to bypass electronic jamming systems and target critical infrastructure with high precision.

A New Tactic Bypasses Defenses

Ukraine has heavily fortified its energy facilities with concrete sarcophagi, anti-drone nets, and extensive electronic warfare systems designed to disrupt the radio signals that control most drones. However, the new First Person View (FPV) drones employed by Russia use a thin, physical fiber-optic cable for guidance, making them immune to signal interference.

Footage verified by the London-based Centre for Information Resilience (CIR) and confirmed by Reuters shows a two-step attack method. According to Joshua Scriven, an investigator at CIR, an initial drone is used to create a hole in the protective netting around a substation. A second drone is then flown through the gap to strike the facility's most critical component: the autotransformer.

Significant Financial and Strategic Impact

The economic asymmetry of these attacks is stark. An FPV drone guided by fiber-optics can cost as little as $2,000, while the autotransformer it targets in a 330-kilovolt (kV) substation is valued at approximately $3.5 million, according to Oleksandr Kharchenko, head of the Energy Research Centre in Kyiv. Destroying this single component can disable the entire transformer unit.

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CIR has verified at least four such strikes on large 330 kV substations and another four on smaller 110 kV facilities. These attacks have occurred between 16 and 26 kilometers (10-16 miles) from the frontline, demonstrating the growing range of this technology. Scriven noted the strikes appear to be part of a broader Russian strategy to isolate Ukrainian regions from the national grid before targeting local power stations to cause blackouts.

Broader Context

These attacks represent an escalation in Russia's long-standing campaign against Ukraine's energy infrastructure. The tactic appears specifically designed to circumvent the robust defenses Ukraine has erected in response to previous missile and heavy drone strikes. Ukrainian Defence Minister Mykhailo Fedorov recently noted that the security situation in the Sumy region had deteriorated in June, stating that Russia's goal is to "terrorise people and make life in the border regions unbearable."

Russia has consistently denied targeting civilians, maintaining that its strikes serve military purposes. The International Criminal Court has previously issued arrest warrants for senior Russian military commanders in connection with strikes on Ukraine’s power grid between 2022 and 2023.