The suspect had been detained since March 21.
Prosecutors in the northern Polish city of Gdansk said Poland’s authority has detained a foreign citizen on charges of spying for Russia.
This was made known in a statement issued on Monday, noting that the suspect had been detained since March 21.
“The findings made in the case show that the suspect acted for the benefit of Russian intelligence by obtaining and collecting information… on critical infrastructure in the Pomeranian and Kuyavian-Pomeranian Regions and on the activities of services and bodies responsible for security,” they said.
“The information obtained was passed on to the Russian intelligence service,” the statement added.
The arrest comes after Poland reportedly dismantled a Russian spy network that had been preparing acts of sabotage and monitoring rail routes to Ukraine.
Reuters reports that the largest country on NATO's eastern flank finds itself increasingly targeted by Moscow's intelligence services.
The war in Ukraine has plunged what were already strained relations between Poland and Russia to new lows, with Warsaw saying it is frequently the subject of Russian espionage and disinformation.
If found guilty, the suspect could face up to 10 years in prison.
Poland had earlier detained nine foreign nationals whom it accuses of operating as part of a spy network on behalf of Russia. The group monitored arms shipments going through Poland to Ukraine and were also preparing actions to “paralyse” such deliveries, say the Polish authorities.
After the news was first reported unofficially by Polish broadcaster RMF, interior minister Mariusz Kamiński held a press conference at which he confirmed the arrests.
He said that individuals from “beyond the eastern border” had been working on behalf of Russia and were “paid on an ongoing basis by the Russian services”. Six had previously been taken into custody on an unspecified date.