MOSCOW (AP) — Russia said Friday it was expelling diplomats from Sweden, Poland and Germany, accusing them of attending a rally in support of opposition leader Alexei Navalny, as international tensions grew over the jailing of the Kremlin’s most prominent foe.

The announcement came as the European Union’s foreign affairs chief Josep Borrell told Russian Foreign Minister Sergey Lavrov that the treatment of Navalny represents “a low point” in relations between Brussels and Moscow.

The Russian Foreign Ministry accused Swedish and Polish diplomats in St. Petersburg and a German diplomat in Moscow of taking part in what it called “unlawful” rallies on Jan. 23. Tens of thousands of people across Russia took to the streets that day to protest Navalny's arrest.

The diplomats were declared “persona non grata” and were required to leave Russia “shortly,” a ministry statement said.

European officials immediately denounced the move.

Sweden “considers this entirely unjustified, which we have also conveyed to the Russian side,” Foreign Ministry spokesman Mats Samuelsson said in a statement to The Associated Press. Stockholm “strongly rejects Russian claims that the diplomat took part in a demonstration in Russia" and “reserves the right to take appropriate measures in response,” he said.

German Chancellor Angela Merkel echoed his statement.

“We consider this expulsion unjustified and think it is another facet of the things that can be seen in Russia at the moment that are pretty far from the rule of law,” Merkel said in Berlin after a videoconference with French President Emmanuel Macron.

Macron condemned “in the stronger terms” the expulsions and what happened to Navalny “from the beginning to the end." He expressed solidarity with Germany, Poland and Sweden.

Before he met with Lavrov, Borrell said “our relations are under a severe strain, and the Navalny case is a low point in our relations.”

Afterward, Borell said he had relayed his concerns over Navalny’s jailing and the arrests of thousands of who had rallied on his behalf. The EU official said he also communicated the bloc's support for Navalny's release and for an investigation of the August poisoning but added that there were no proposals of additional sanctions against Russia from the EU at this point.

Lavrov, in turn, again accused European officials of refusing to share evidence of the poisoning. The Kremlin has said it won’t listen to Western criticism of Navalny’s sentencing and police action against his supporters.

Navalny, 44, an anti-corruption investigator and Russian President Vladimir Putin’s most prominent critic, was arrested Jan. 17 upon returning from Germany, where he spent five months recovering from a nerve-agent poisoning that he blames on the Kremlin. Russian authorities have rejected the accusation.

On Tuesday, a Moscow court ruled that while in Germany, Navalny violated probation terms of his suspended sentence from a 2014 money-laundering conviction and ordered him to serve two years and eight months in prison. The ruling prompted international outrage.

In the mass protests across Russia's 11 time zones for two weekends in a row, many people chanted slogans against Putin in the largest show of discontent in years. Thousands were detained. Several of Navalny's close allies face criminal charges and are under house arrest, and many of his associates were handed short jail terms.

After the crackdown, top Navalny strategist Leonid Volkov said protests should pause until spring after reaching a peak. He said demonstrators won a “huge moral victory” and argued that trying to maintain rallies every weekend would only lead to many more arrests and wear out the participants.

Instead, he urged supporters to focus on challenging Kremlin-backed candidates in September’s parliamentary elections and securing new Western sanctions against Russia to press for Navalny’s release. He said Navalny’s team would try to ensure that “every world leader would discuss nothing but Navalny’s release with Putin.”

On Friday, however, another Navalny ally, Vladimir Milov, expressed disappointment with Borrell's visit to Moscow. He called it a “disastrously weak visit" and said Lavrov “used him as a decoration to lecture Europe on ‘international law.’”

“Maybe he’ll bring back some Sputink V vaccines as a reward,” Milov tweeted, referencing Borrell's praise of Russia's domestically developed coronavirus vaccine.

Navalny, meanwhile, was back in court Friday for yet another trial — this time on a charge of defaming a World War II veteran featured in a pro-Kremlin video that Navalny denounced on social media last year.

A criminal probe was opened after Navalny slammed people featured in a video promoting constitutional amendments last year that allowed an extension to Putin’s rule. Navalny called the people in the video “corrupt stooges,” “people without conscience” and “traitors.”

Russian authorities maintained that Navalny’s comments “denigrate (the) honor and dignity” of Ignat Artemenko, the veteran featured in the video.

If convicted, Navalny faces a fine or community service. He has denied the charge and refused to enter a plea on Friday, calling the trial a “PR process" aimed at disparaging him.

"The Kremlin needs headlines (saying that) Navalny slandered a veteran,” he said.

Artemenko, 94, took part in the hearing via teleconference, saying he was distressed by Navalny's comments and demanding a public apology.

Navalny accused Artemenko’s family of exploiting the frail man for their own gain, alleging the case was fabricated and the evidence falsified.

“The judge should burn in hell, and you’re selling your grandfather out,” Navalny said, as Artemenko’s grandson testified for the defense.

The hearing was eventually adjourned until Feb. 12.