WARSAW, Poland (AP) — A disciplinary court in Poland on Thursday lifted the immunity of a judge who fled the country to neighboring Belarus, an autocratic ally of Russia, paving the way for an international arrest warrant for him on espionage allegations.

Poland’s prosecutors and special services launched an investigation this week after Belarus media reported that the judge, Tomasz Szmydt, arrived in the country and asked for protection. Politicians in Poland, which is a NATO and European Union country, vowed to take immediate steps to strip Szmydt of his immunity as a judge, remove him from his post and take actions to bring him to justice.

Szmydt was notorious in Poland for having engaged in a 2019 online smear campaign against other judges that was sponsored by the Justice Ministry under the previous right-wing government.

Justice Minister Adam Bodnar said stripping him of immunity allows for posting an international arrest warrant for Szmydt through Interpol. Even if Belarus ignores it, the warrant would restrict Szmydt’s ability to travel.