Polish authorities have detained eight individuals, including a Ukrainian working for Russian intelligence, for allegedly planning sabotage against military and critical infrastructure across Poland, with arrests happening in various regions.

The suspects are accused of scouting military facilities and critical infrastructure, and preparing explosives and incendiary materials for sabotage and attacks targeting Ukraine.

Poland's secret service confirmed the detentions and indicated ongoing operational activities, though details remain undisclosed.

Authorities intercepted shipments containing detonators and chemicals intended for Ukraine, which were defused in time to prevent attacks.

Recent drone incursions by unknown entities have heightened security concerns across Europe, leading to airport closures in Germany and Denmark, with Danish Prime Minister Mette Frederiksen warning of an emerging hybrid war.

In response to these threats, Poland plans to urgently upgrade its air defenses, and the EU is considering establishing a 'drone wall' along its eastern borders to counter such drone activities.

Polish Prime Minister Donald Tusk and the country's minister for special services confirmed the detentions and described the suspected activities as part of a broader security challenge.

Tusk stated that the case is ongoing and that further operational efforts are underway, but he did not disclose specific details.

Western officials have accused Russia and its proxies of orchestrating numerous attacks across Europe, including arson, explosives plots, hacking, and spying, since the invasion began.

Countries like Lithuania, Latvia, and the UK have also accused Moscow of conducting sabotage and espionage activities, which Russia denies, claiming they are motivated by Russophobia.