"[Leonid Sviridov's] lawsuit has been registered. Terms of lawsuit's consideration are yet to be determined," court spokeswoman Joanna Kube said, as quoted by the Polish press agency.
Sviridov had been working in Warsaw since 2003. In October 2014, the Polish Foreign Ministry revoked his press accreditation without explanation, following a request from the country's Internal Security Agency. In addition, Sviridov's Polish residence permit was cancelled.
Sviridov's case has already been included twice in the Organization for Security and Co-operation in Europe (OSCE) monitoring reports on freedom of the media, which documents violations of journalists' rights within OSCE member states. In September, Rossiya Segodnya called on the OSCE to continue to press for the upholding of free speech in all its member states, and actively oppose discrimination against journalists.