Poland has detained and charged one of its citizens with spying for Russian intelligence services.
Warsaw's state prosecutor's office says the suspect, a 28-year-old named as Wiktor Z, collected and distributed information concerning the functioning of facilities key to Poland's defence.
The prosecutor's statement says the suspect "acted out of ideological motives and pro-Russian beliefs" and could now face between eight years and life in prison.
Warsaw has accused Moscow of being behind a series of acts of sabotage in Poland, including a huge fire at a shopping centre last year. In response, Moscow has accused Poland of Russophobia.