German radar maker Hensoldt has signed a memorandum with Ukraine's Defense Ministry for more large-scale radar deliveries, the company said on 5 October. Ukrainian defense outlet Defense Express reads it as a step toward fitting Hensoldt's TRML-4D, already in Ukrainian service, into FREYJA, a planned shield against ballistic missiles.

Ballistic missiles remain the hardest threat in Russia's air war. After Russia's overnight barrage on 7 October, Ukrainian President Volodymyr Zelenskyy said Ukraine is still searching daily for Patriot missiles. The only other system Ukraine can use against them is the Franco-Italian SAMP/T, which fires Aster 30 interceptors made in small numbers. That gap is why Fire Point is reworking its FP-7 missile into a Patriot-like interceptor. Such an interceptor still needs radars to find its target first.

A memorandum signed during Merz's visit

Hensoldt CEO Oliver Dörre signed the document on the sidelines of German Chancellor Friedrich Merz's visit to Ukraine. Beyond deliveries, it covers further development of radar capabilities. The partners will also study options to deploy and jointly operate TRL-4D LR long-range radars. Hensoldt said this expands cooperation already agreed on in ballistic missile defense.

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The TRL-4D LR is the land-based version of a long-range radar Hensoldt also builds for the German Navy, German outlet Sicherheit & Verteidigung reported. The outlet cited Germany's defense procurement office as giving the naval version a range of more than 400 km (250 miles) against air targets. That, it concluded, puts the range well beyond the TRML-4D's.

"The Ukrainian air defence forces urgently need our high-performance radars to help protect infrastructure such as bridges," Dörre said.

Defense Express, describing the same memorandum, tied both the mass deliveries and the joint-operation plan to the TRML-4D. Hensoldt's release names no model for the deliveries and links joint operation to the TRL-4D LR.

Eyes for FREYJA

Hensoldt and Fire Point signed a memorandum on FREYJA at the Eurosatory arms show in Paris in June, with the TRML-4D to play a key role, Hensoldt announced. Fire Point is set to act as prime contractor and hold design authority. Hensoldt is to produce, test, and deliver the radars.

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Defense Express expects any study of deployment options to focus on how well the radar detects ballistic missiles and relays that data. Hensoldt has its own unit in Ukraine to work closely with operators, the outlet noted. Earlier, the company began setting up a local hub so Ukraine can service and repair the TRML-4D itself.

Already on duty

Ukraine's military uses the TRML-4D both standalone and as the built-in radar of the IRIS-T SLM medium-range air defense system, Defense Express noted. Hensoldt lists an instrumented range of 250 km (155 miles) at altitudes up to 30 km (19 miles). Defense Express, citing the manufacturer, gives track ranges of more than 120 km (75 miles) for fighter jets and more than 60 km (37 miles) for supersonic missiles.

More radars give earlier warning of ballistic strikes, but they cannot stop them. Until the FP-7.X makes its first ballistic intercept, planned for mid-2027, that job stays with Patriot and SAMP/T missiles. Partners delivered three times fewer air defense missiles in the first half of 2026 than a year earlier, Zelenskyy said on 5 August.

A Ukrainian Hornet drone struck a Russian radar system about 120 kilometers behind the front, Taras Myshak, senior communications officer of the 59th Separate Assault Brigade of Unmanned Systems, said on Suspilne on 28 September, ArmyInform reported. The brigade's Signum unmanned systems battalion carried out the strike about a week earlier, he added.

Russia's air defenses depend on radars to see Ukrainian drones and missiles coming. Every radar it loses weakens that watch and gives the next Ukrainian strike a better chance of getting through.

According to Myshak, the target was a "quite expensive" Russian radar system.

A radar system is effectively the "eyes" of the Russian air defense system: it detects aerial targets, determines their coordinates, and transmits information to other elements of the system.

Russians continue probing Ukrainian defenses

Russian forces in the brigade's zone, roughly along the Donetsk Oblast border, continue to operate in small infantry groups and use infiltration tactics, Myshak says. At the same time, the Russians are trying to cut Ukrainian logistics, he adds, saying that the brigade is effectively holding the Russian army back from infiltrating into Dnipropetrovsk Oblast.

The Russians' main means in this sector remain drones and infantry, the serviceman says. The number of infantry has decreased somewhat compared with previous periods, but the pressure from the enemy has not stopped, he adds.

"Of course, they will try, they will constantly probe, so to speak, our defense with their infiltrations. And likewise with drones, of various ranges, working on logistics, making it impossible for us to enter positions, to deliver everything necessary to the positions, in order to make our defense impossible," Myshak emphasized.

At the same time, Ukrainian troops are trying not only to defend against these actions but also to deprive the Russians of radars, electronic warfare systems, and other equipment, the serviceman says. "We likewise don't let them relax," he said.

Ukraine systematically knocks out the "eyes" of Russian air defense

In October 2024, Ukraine's military said it had hit a Russian Nebo-M radar station with ATACMS ballistic missiles to blunt Moscow's ability to spot and shoot down aircraft and missiles, Reuters reported. The military estimated each such system at more than $100 million.

Ukraine is systematically increasing its use of medium-range strike drones, which can hit targets up to 200 kilometers deep inside enemy territory, the Ukrainian Defense Ministry reported in May this year. Russian air defenses and radars are among the main priorities of such operations, as their destruction weakens the system for detecting and intercepting aerial targets, the ministry said. Medium-class drones, including the FP-2, Hornet, and Bulava, play a critical role in such strikes, the ministry noted.

According to the General Staff of the Armed Forces of Ukraine, Ukrainian forces struck at least 25 major Russian air defense and radar systems during April, about 12 of which were radar systems, the Ukrainian Defense Ministry also wrote in May this year.