Polish authorities have accused a Russian journalist working for a pro-Kremlin news agency of posing a threat to Poland's security and say that he should be deported.

The case comes amid tensions between the West and Russia over Moscow's actions in Ukraine. Poland, which was under Moscow's control for most of the past two and a half centuries, is one of the most outspoken European voices in favor of sanctions on Russia.

Rossiya Segodnya agency journalist Leonid Sviridov first came under suspicion for apparent espionage last year when Poland's Internal Security Agency declared him "a danger" to Poland. The Foreign Ministry stripped him of his journalist's accreditation and the Warsaw regional governor's office opened an investigation.

The governor's office announced Wednesday that it supports the security agency's assessment of him.