Polish authorities arrested 12 individuals this week in relation to the recent acts of sabotage allegedly carried out on behalf of Russian agencies, which include arson, attempted arson, as well as physical attacks.

According to the Bloomberg report, the Rzeszów-Jasionka Airport, located near the Ukrainian border, is the main transportation hub for 90% of armament and military equipment. It also serves as a transfer point for foreign leaders visiting Kyiv.

In the interview published on the Bloomberg.com website on Thursday, Tomasz Siemoniak spoke about security concerns after this week’s announcement of a string of arrests exposed growing worries regarding sabotage operations supported by Russia. These concerns extend beyond Poland and encompass various countries across Europe.

“We are facing a foreign state that is conducting hostile and—in military parlance—kinetic action on Polish territory,” Siemoniak said. “There has never been anything like this before.”

He did not outline the measures that the airport would implement.

Bloomberg noted that in April, Polish police arrested a man suspected of being involved in a plot to assassinate Ukrainian President Volodymyr Zelenskyy and gather information about the Rzeszów-Jasionka Airport.

According to Siemoniak, the situation is “very serious.”

“We’re no longer talking about agents of influence or some online activities,” he said. “These are individuals who are ready to come and set things on fire.”