The two officers questioned him about France's tiny community of immigrants from Tajikistan, an impoverished former Soviet republic in Central Asia.

"Who do you know? How many? Where?" Varki recalled the officers asking, with one of them speaking Russian, a commonly used language across Central Asia. Varki, a political refugee in France who has worked for outlets including the BBC, told the police callers he knew a handful of Tajiks in the country, mainly fellow emigres and dissidents.

"But I don't know any jihadists," he told them.

Ahead of the Paris Olympics that begin on July 26, French security services have been racing to address an intelligence blind spot and forge deeper ties with Tajiks and other Central Asians in the country, according to more than a dozen people with knowledge of the drive. They include current and former intelligence officials, police, diplomats and Central Asian migrants who have been contacted by authorities.

The outreach, which hasn't been previously reported, comes in the wake two major attacks this year that authorities say were carried out by Tajik members of ISIS-K, a resurgent wing of Islamic State named after the historical region of Khorasan that included parts of Iran, Afghanistan and Central Asia.

A double suicide bombing in Iran on Jan. 3 killed about 100 people at a memorial ceremony for slain Revolutionary Guards commander Qassem Soleimani, while the Moscow tragedy on March 22 saw gunmen open fire at concertgoers at Crocus City Hall, killing more than 130 people.

French authorities say they have already foiled one Islamist attack on the Olympics, with the arrest in late May of an 18-year-old Chechen man suspected of planning a suicide mission on behalf of Islamic State at Saint-Etienne's soccer stadium, where France, the United States and Ukraine will play.

With its complex colonial past, lingering anti-Muslim sentiment and historic involvement in Middle Eastern and African wars, France has long been a target of Islamist attacks. Last month, Paris police chief Laurent Nunez said "Islamist terrorism remains our main concern" at the Olympics, though authorities say there have been no direct threats against the Games.

Tajikistan, plagued by civil war in the 1990s, is the poorest of the former Soviet republics. It relies on remittances from migrants - mainly in Russia - for nearly half of its economic output.

Poor, isolated young men among the Tajik diaspora have proven to be an attractive recruiting pool for ISIS-K, according to many security experts. Yet French intelligence has few Central Asian assets, an intelligence source told Reuters, and finds their small, tight-knit communities hard to penetrate. According to France's Tajik Association, there are around 30 Tajik families living in the country.

The intelligence source, who requested anonymity to discuss security matters, said ISIS-K represented a relatively new threat, with recruiters-cum-handlers who are based abroad able to remotely radicalize and activate Central Asians in France to carry out attacks on French soil.

As evidence, the source pointed to the case of a Tajik man who was arrested in 2022 for plotting an attack in Strasbourg. The source said the man was acting under instruction from ISIS-K handlers based abroad.

A second security source said France had identified a dozen ISIS-K handlers, based in countries around Afghanistan who have a strong online presence and try to convince young men in European countries who are interested in joining up with the group overseas to instead carry out domestic attacks.

The handlers then connect the recruits with people who can provide fake IDs and weapons on the ground in the country involved, according to the source, in a process that can take just a few weeks.

Reached by Reuters, the two police officers who spoke to Varki declined to comment. Paris police referred questions to the French interior ministry, which declined to comment.

Tajikistan's foreign ministry didn't respond to a request for comment.

COMPLEX OPENING CEREMONY

Along with Varki, Reuters spoke to two other Tajiks and one Uzbek based in France who had been contacted by police and questioned about their communities.

Nadejda Atayeva, an Uzbek human rights activist in the northwestern city of Le Mans, said she gave officials Varki's phone number after meeting with them at police HQ in Paris.

"I was asked for contacts of Tajiks I trust. I was told that they wanted to talk to Tajiks to get their opinion on the events in Moscow," she said.

Sebastien Peyrouse, a French academic who has briefed French and U.S. security agencies on Central Asian militancy, said Paris may have been slow to react to the potential Tajik threat.

"France has focused much more on radicalized people coming from the Middle East, from Algeria, from northern Africa, than from Central Asia," he said. "I think France was pretty surprised by what happened in Moscow and it could be a little bit late."

Russian intelligence still has the best oversight of Central Asian militant networks, despite failing to prevent the Crocus City Hall attack, said Edward Lemon, a Tajikistan expert who regularly briefs Western spy agencies.

Yet intelligence-sharing between Russia and France about Islamic State and other militant groups has been drastically reduced since Moscow's invasion of Ukraine in 2022, French Defence Minister Sebastien Lecornu said in April this year.

Two U.S. State Department officials coordinating Olympics security for Team USA told Reuters they were confident in France's preparations. Without going into specifics, they said French efforts to build deeper ties with its Tajik population reflected a common counter-terrorism practice to learn more about possible threatening actors within the community.

"Everybody would like to have" more information on Central Asian threats, one of them said, speaking on condition of anonymity.

FIGHTERS RETURN FROM SYRIA

The main Tajik militant risk in Europe comes from about a dozen radicalized men who fought in Syria and have slowly filtered back into the continent via Ukraine following the decline of Islamic State in the Middle East, according to Lemon and other two other Central Asia experts interviewed.

Last year, German authorities arrested seven Central Asians living in the country on suspicion of founding a terrorist organization. The Turkmen, Tajik and Kyrgyz nationals entered Germany from Ukraine shortly after the Russian invasion in early 2022, prosecutors said. They are currently in jail awaiting trial.

Lemon estimated there were tens of thousands of Tajiks living in Europe, mainly concentrated in Poland and Germany. Most are political refugees who arrived roughly a decade ago after Tajik President Emomali Rakhmon designated two opposition movements - Group 24 and the Islamic Renaissance Party - as extremist and terrorist organizations. Rakhmon, an ally of Russia, has ruled Tajikistan for 30 years.

Varki, an outspoken Rakhmon critic, said he had sought asylum in France in 2016 because he loved French culture and literature. He said he had never spoken with French security services until the police called him in March.

Muhammadiqboli Sadriddin, another Tajik dissident living in France, said he too had spoken with police.

"They asked me what I knew," said Sadriddin. He added that he was eager to help but told them: "I do not know Tajiks with a radical opinion."

Three counter-intelligence experts told Reuters that France's efforts to infiltrate the Tajik community could prove counter-productive.

A former U.S. spy, speaking on condition of anonymity to discuss his time working with French security services on Central Asian issues, said French counter-intelligence was generally very well regarded. But he said pressuring Tajiks for information could backfire by stigmatizing them, making them less likely to want to flag risky individuals.

Jean-Francois Ratelle, a specialist on Islamist militancy at the University of Ottawa, agreed.

"This community-building relationship should have been done years ago. If it's with a counter-terrorism mindset, then it's a recipe for failure," he said. "If France decides to put too much pressure on that diaspora, it might create the very threat that they are trying to eliminate for the Olympics."