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The Dutch intelligence service says it has uncovered a Russian military agent attempting to use a false identity to infiltrate the International Criminal Court which is investigating accusations of war crimes in Ukraine.
Sergey Vladimirovich Cherkasov created an elaborate cover story dating back years to try and enter the Netherlands as a Brazilian citizen for an internship at the Hague-based ICC in April, the agency's head told Reuters.
"This was a long-term, multi-year GRU operation that cost a lot of time, energy and money," said Dutch intelligence agency chief Erik Akerboom, using the acronym for Russia's military intelligence service.
There was no immediate reaction from Russia although President Vladimir Putin's government has in the past frequently denied spying accusations as a foreign smear campaign.
The Dutch General Intelligence and Security Service (AIVD) said in a statement that the man, who went by the alias Viktor Muller Ferreira, was picked up at a Dutch airport.
He was declared an undesirable alien and put on the next flight back to Brazil, where he faces court proceedings, it added.
"It clearly shows us what the Russians are up to - trying to gain illegal access to information within the ICC. We classify this as a high-level threat," Akerboom added, saying the ICC had accepted him for an internship.
ICC spokeswoman Sonia Robla said the court was grateful to Dutch authorities for the operation and the exposing of security risks.
"The ICC takes these threats very seriously and will continue to work and co-operate with the Netherlands," she said.
There was no immediate comment on the case from Brazilian authorities.
The Dutch agency said it had taken the unusual step of releasing detailed information on the case to expose the workings of Russian intelligence and threat to other international institutions.
It distributed a four-page document outlining what it said was Cherkasov's invented cover story.
That included a supposed troubled family history and details from a club where he liked to listen to electronic trance music and his favourite restaurant in Brasilia where he would eat cheap brown bean stew.
"Cherkasov used a well-constructed cover identity by which he concealed all his ties with Russia in general, and the GRU in particular," the statement said.
The ICC, a permanent global war crimes tribunal with 123 member states, opened an investigation in Ukraine just days after Putin order troops in on February 24.
It is examining allegations of war crimes, crimes against humanity and genocide.
Dutch authorities have expelled more than 20 Russians accused of spying in recent years.
They include four people accused in 2018 of hacking the Organisation for the Prohibition of Chemical Weapons, two accused of spying in the corporate, high-tech sector in 2020 and 17 suspected operatives accredited as diplomats who were thrown out after this year's invasion of Ukraine.
Russia has denied all the charges and responded to the latest expulsions by also kicking out 15 Dutch embassy and consulate staff from Moscow and St Petersburg.