Estonia has accused members of the Koos party of working for Russia

An Estonian court has handed lengthy prison sentences to the leaders of an anti-NATO party convicted of working on behalf of Russia to undermine the Baltic state's security.

On Thursday, the Harju District Court sentenced Aivo Peterson, co-founder of the small conservative Koos (Together) party, to 14 years in prison for treason. His associates Dmitri Rootsi and Andrei Andronov received sentences of 11 years and 11 years and six months, respectively. All three denied any wrongdoing and said they would appeal the verdict.

Prosecutors alleged that the defendants spread "narratives supporting Russia's foreign and security policy" intended to undermine public trust in NATO and Estonia's military aid to Ukraine.

"The defendants deliberately assisted Russia in activities directed against the Estonian state and society," State Prosecutor Triinu Olev-Aas said.

Founded in 2022, Koos calls for Estonia to leave NATO, become a neutral state, remove foreign troops from its territory, and "refrain from participating directly or indirectly in military conflicts between other countries."

In 2023, Peterson traveled to Russia's Donetsk People's Republic, which Estonia considers occupied Ukrainian territory. He said at the time that he was gathering information about the Russian-Ukrainian conflict. "There are two sides to every conflict, but the information we receive from Estonian media is one-sided. All of our journalists support Kiev, which often comes across as propaganda," Peterson said.

The Koos party rejected the allegations against its members, arguing that prosecutors had failed to present "concrete proof that their actions had caused real damage to Estonia's constitutional order or security."

Estonia is one of Ukraine's top supporters and has been pushing for further militarization of Europe. Russian Foreign Ministry spokeswoman Maria Zakharova labeled Estonia "one of the most hostile countries" in June and accused Tallinn of "spreading myths and falsehoods about the supposed threat from the East."