Tusk reports suspicious overnight activity near Poland's border with Russia's Kaliningrad Oblast

"Just after midnight, I received a report from the Border Guard about suspicious activity on the Polish-Russian border in the north. People with flashlights were spotted. We very quickly deployed the necessary forces and resources to the area and managed to prevent a provocation," Tusk said.

The prime minister said that while Poland had not experienced any tragic incidents overnight, it was essential to "remain extremely vigilant."

"Tensions and escalation on Russia's part may continue, and we must remain vigilant and prepared to prevent any potential provocations," he said.

Tusk said Poland had received intelligence from its own security services and allies indicating that acts of sabotage, subversive operations or more serious provocations organized by hostile intelligence services could occur in early November.

NATO's Supreme Allied Commander Europe, Alexus Grynkewich, had also warned of such a possible scenario.

"After receiving more specific intelligence that incidents could occur in the first half of November, including incursions by armed individuals into Polish territory, we decided to deploy substantial police and counterterrorism forces to the border and reinforce border security," Tusk said.

He said a special operations command center had been established at the National Police Headquarters to coordinate an operation in the Warmian-Masurian and Podlaskie voivodeships. Police are conducting the operation in cooperation with the military, Border Guard and intelligence services.

On Oct. 13, Ukraine's Foreign Intelligence Service reported that Russia had not ruled out the possibility of a direct war with Europe and was considering it among potential military conflict scenarios through 2045. Six of those scenarios concern Northern Europe, while plans involving Poland and the Baltic states are also being developed.

On Sept. 24, the Danish Defense Intelligence Service warned of a "small but growing risk" that Russia could launch a limited military offensive against one or more neighboring NATO countries in the coming months.

Earlier, the heads of intelligence services in Czechia, Latvia and Sweden also warned that Russia could intensify sabotage operations across Europe in the coming months.

On Oct. 2, Ukraine's Defense Intelligence Directorate reported that Russian intelligence services had been instructed to step up their activities in European Union and NATO countries. The preparations reportedly involve hybrid operations aimed at undermining assistance to Ukraine and weakening the alliance's capabilities.