Polish and Romanian authorities have arrested Ukrainian citizens allegedly working for Russian intelligence in a sabotage campaign, prosecutors said Tuesday.

Polish prosecutors stated that the suspects planned to send shipments containing explosives and incendiary materials to Ukraine, designed to ignite or explode during transit. The aim, they said, was to intimidate populations and destabilize EU countries supporting Ukraine. In Romania, two Ukrainians, aged 21 and 24, allegedly acting for Russian intelligence, deposited parcels with improvised explosive devices at a Bucharest courier. Romanian intelligence specialists defused the devices, and the suspects were placed under 30-day preventative arrest.

The Ukrainian detained in Poland was among eight people recently arrested over sabotage preparations, according to the National Prosecutor's Office. Prime Minister Donald Tusk and Tomasz Siemoniak, the minister coordinating special services, confirmed that the plot involved reconnaissance of military and critical infrastructure, preparation of sabotage materials, and potential attacks.

Authorities across Europe have detained dozens for suspected sabotage and espionage linked to Russia since its full-scale invasion of Ukraine in February 2022. Recent cases include arson plots, attacks on cargo planes, store fires, cyberattacks, and spying networks in multiple countries.