By Andrew Osborn
MOSCOW (Reuters) -Prominent Russian nationalist Igor Girkin, who had publicly accused President Vladimir Putin and the army top brass of not pursuing the war in Ukraine harshly or effectively enough, was remanded in custody on Friday on charges of inciting extremism.
His arrest earlier in the day by his ex-employer, the FSB state security service, suggests authorities have wearied of his criticism of what they call Russia's "special military operation", and perhaps of other loud nationalist voices who had appeared to have exceptional licence to deride the war effort.
It follows an abortive mutiny last month led by another outspoken critic, Yevgeny Prigozhin, boss of the Wagner mercenary force, who is still free but has sharply curtailed his own verbal attacks.
The charge brought by FSB prosecutors carries a maximum sentence of five years in prison, state news agencies TASS and RIA Novosti reported. The RBC news site said the Meshchansky district court in Moscow had remanded Girkin, 52, in investigative custody until Sept. 18.
Girkin, a former FSB officer and battlefield commander also known as Igor Strelkov, helped Russia to annex Crimea in 2014 and, soon after, to organise pro-Russian militias who wrested part of eastern Ukraine out of Kyiv's control - events that started Russia's war on Ukraine.
He was also handed a life sentence in absentia by a Dutch court in 2022 for his alleged role in the shooting down of Malaysia Airlines flight MH17 over eastern Ukraine in 2014, with the loss of 298 passengers and crew.
In footage from court posted by the popular Telegram channel Shot, Girkin stood almost motionless in a glass cage, with his arms folded, staring straight ahead.
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He had been regarded by many as untouchable due to his history and ties to the authorities, but had become more outspoken in recent months.
Girkin announced in May that he and others had set up the "Club of Angry Patriots" to save Russia from what he said was the danger of systemic turmoil, due to military failures in Ukraine and jostling in the elite to eventually succeed Putin.
Asked at the time if he was naive to launch a political movement without the assent of the Kremlin, he said: "I hope you would not call me a naive person."
In one of his most outspoken tirades, in a post on July 18 on his official Telegram channel, followed by more than 760,000 people, Girkin peppered Putin with personal insults and urged him to pass power "to someone truly capable and responsible".
RBC, citing two unnamed law enforcement sources, said Girkin's Moscow home had been searched.
Tatiana Stanovaya, founder of the R.Politik analysis firm, said the men who run Russia's law enforcement and power ministries had long wanted to arrest Girkin.
"Strelkov (Girkin) had overstepped all conceivable boundaries a long time ago," she said. "This is a direct outcome of Prigozhin's mutiny: the army's command now wields greater political leverage to quash its opponents in the public sphere."
Stanovaya said Girkin's detention was a signal that any of the bitterest critics of Moscow's approach to the war could face prosecution.
(Reporting by Andrew Osborn; Editing by Kevin Liffey and David Holmes)