Polish officers have detained a Ukrainian accused of trying to murder a figure from Ukraine's weapons sector on Moscow's orders, Reuters reported. Investigators say his homemade explosive failed to detonate, and he fled to Poland, where officers detained him. The case is the latest in a run of Russian-directed plots targeting people tied to Ukraine across Europe.

A car bomb that failed

The suspect, named only as Serhii P. under Polish privacy rules, allegedly went after a figure in Ukraine's weapons sector in Irpin, a town in Kyiv Oblast just northwest of the capital. The ABW, Poland's Internal Security Agency, said he planted an improvised explosive device under a car used by the potential victim. The device was meant to be set off remotely with a cellphone, but it "did not detonate due to a malfunction," the agency said.

The suspect, a 63-year-old Ukrainian, fled to Poland after the attempt collapsed and was arrested in Warsaw on 5 August 2026, the Ukrainian outlet NV says. Polish authorities announced the arrest on 20 August and said it kept him from using Poland as a hideout while he dodged investigators. Prosecutors charged him with trying to kill with a bomb and with holding explosives without a permit. The charges carry a floor of 15 years behind bars and a ceiling of life, they said.

Explore further

Ukraine detains organizer of defense industry event struck by Russian missile that killed 10, charged with negligence

The ABW framed the case as proof that Russian intelligence runs operations far beyond its own borders, using people who move between countries to do the work. For years, Kyiv and Western capitals have said Moscow enlists people — Ukrainians among them — to run sabotage and spying missions, a charge Russia keeps rejecting.

A pattern across Europe

The plot fits a wider Russian campaign. Weeks earlier, Warsaw detained a Russian man whom Moscow had allegedly recruited to murder a Ukrainian-American in the same city. 

Earlier this year, Ukrainian investigators recently exposed a coordinated scheme to kill a Russian dissident and Ukraine supporter in Lithuania, German prosecutors filed sabotage charges against a Ukrainian and a Latvian, and an earlier plot targeted the chief of German arms-maker Rheinmetall.

Poland and the Baltic States have been named prime targets for Russian sabotage over their backing for Kyiv.

Poland has held up a Ukrainian search at Łasków for months, Ambassador Vasyl Bodnar told Polish broadcaster RMF24, NV reported on 19 August. He says the eastern Polish village may contain the remains of civilians killed there by Polish underground forces in 1944.

The permit dispute is part of a much larger argument over how Ukraine and Poland remember the wartime killings of Poles and Ukrainians. Reciprocal searches resumed only recently after years of deadlock, giving both countries a way to recover and identify victims even as they disagree over historical responsibility. The latest delay tests that fragile progress while Poland remains Ukraine’s main route for Western arms and aid.

Bodnar says Ukrainian civilians were killed at Łasków in 1944 by the Home Army—Poland’s principal underground resistance force during the Nazi occupation—and the Peasant Battalions, an agrarian underground movement.

Bodnar appealed to Poland to issue "at least one permit" for searches on its territory. He said Ukraine systematically approves Polish requests in return. The ambassador blamed the holdup on unspecified “bureaucratic restrictions” and urged Warsaw not to leave the impression that Kyiv was obstructing the work.

In July, Bodnar said Poland’s Institute of National Remembrance had supported the Łasków application procedurally and that only approval from the regional monuments conservator remained. He expected work to start in August.

The institute said it had assisted with Łasków but was awaiting more documents for Ukraine’s separate applications concerning Sahryń and Przemyśl.

Past Polish-Ukrainian exhumations

Reciprocal work between Ukraine and Poland resumed only after Kyiv lifted a moratorium imposed in 2017. Ukraine had halted Polish exhumations in response to the destruction of Ukrainian memorial sites on Polish soil.

Explore further

Ukraine will keep issuing Polish exhumation permits despite historical tensions. Dispute “causes joy in Moscow,” Kyiv says

A joint team exhumed the remains of 42 Polish victims of massacres by Ukrainian nationalists at Puzhnyky in western Ukraine in May 2025. Ukrainian researchers later searched for a suspected grave of up to 18 Ukrainian Insurgent Army fighters at Jureczkowa, Poland, but found none.

Ukraine granted further permits for Polish searches in 2026. Joint work at Uhly in Rivne Oblast found no mass grave, while exhumations began at Ostrivky and Volia Ostrovetska in July.

Historical grievances strain wartime alliance

The searches are the practical core of a broader dispute over wartime killings of Poles and Ukrainians. Competing interpretations of the Volyn tragedy and battles over Ukrainian Insurgent Army symbols have increasingly spilled into Polish politics and the streets.

Kyiv says it continues approving Polish grave searches while its own researchers wait to begin work in Poland.