"The Russian FSB has opened and is investigating criminal cases ... against US journalist Nick Paton Walsh and Ukrainian correspondents Olesya Nikolaevna Borovik and Diana Vladimirovna Butsko, who illegally crossed the Russian state border and filmed in the area of the village of Sudzha in the Kursk Region," the FSB said in a statement.
The journalists will be put on the international wanted list in the near future.