MOSCOW —

Russia’s top security agency has arrested an American reporter for the Wall Street Journal on espionage charges, the first time a U.S. correspondent was put behind bars on spying accusations since the Cold War.

Video above: Russian jet strikes US drone

The Federal Security Service said Thursday that Evan Gershkovich was detained in the Ural Mountains city of Yekaterinburg while allegedly trying to obtain classified information.

The Wall Street Journal said it “vehemently denies the allegations” and is seeking Gershkovich's immediate release. "We stand in solidarity with Evan and his family,” the paper said.

The arrest comes amid bitter tensions between the West and Moscow over its war in Ukraine.

Gershkovich is the first American reporter to be arrested on espionage charges in Russia since September 1986, when Nicholas Daniloff, a Moscow correspondent for U.S. News and World Report, was arrested by the KGB. He was released without charges 20 days later in a swap for an employee of the Soviet Union's United Nations mission who was arrested by the FBI.

The FSB, which is the top successor agency to the Soviet-era KGB, alleged that Gershkovich “was acting on the U.S. orders to collect information about the activities of one of the enterprises of the Russian military industrial complex that constitutes a state secret.”

The agency didn’t say when the arrest took place. Gershkovich could face up to 20 years in prison if convicted of espionage.

Gershkovich covers Russia, Ukraine and other ex-Soviet nations as a correspondent in the Wall Street Journal's Moscow bureau.

The FSB noted that he had accreditation from the Russian Foreign Ministry to work as a journalist, but Russian Foreign Ministry spokeswoman Maria Zakharova said Gershkovich was using his journalistic credentials as a cover for "activities that have nothing to do with journalism.”

His last report from Moscow, published earlier this week, focused on the Russian economy's slowdown amid Western sanctions imposed when Russian troops invaded Ukraine last year.

Gershkovich's arrest follows a swap in December, in which WNBA star Brittney Griner was freed after 10 months behind bars in exchange for Russian arms dealer Viktor Bout.

Another American, Paul Whelan, a Michigan corporate security executive, has been imprisoned in Russia since December 2018 on espionage charges that his family and the U.S. government have said are baseless.

In recent years, the Olympic games have become a target for cyber espionage, surveillance and other financially-motivated attacks. 

The NTT Corporation, which provided network security for the Tokyo 2020 Olympics, said there were more than 450 million cyberattacks launched during the 16 days of competition.

That's 2.5 times more than the number of attacks on the 2012 London Olympics.

Beijing won’t be much different.

A report from cybersecurity analysis firm Recorded Future found ransomware groups may try to encrypt machines used at the games, in part because it could lead to a significant profit, given that teams or officials might need to pay ransom to regain access to those systems as soon as possible. 

But experts think the biggest threat is possible cyber espionage and surveillance of athletes and visitors by the Chinese government.

The United States, Team Great Britain, Australia, Germany and Netherlands all urged their athletes and visitors to leave their personal phones and laptops back at home out of fear that they will be monitored by the government at the games and thereafter. 

"China's national security laws create a really different environment for privacy than what people are used to when they're in other countries, where privacy legislation places significant constraints on the government's ability to collect and use data," Robert Potter, CEO and co-founder of Internet 2.0 said.

"The identifiers for your phone are automatically collected, so that information is gone the moment you hit a mobile phone tower in China."

Potter's cybersecurity company Internet 2.0 examined some of the software being provided by official sponsors to the game and found that the Virtual Private Network service offered to athletes, which lets users hide and protect their internet traffic from being accessed by third parties, collected a "significant amount of user data" beyond what was needed to run the app. 

Newsy's research showed the camera and photo libraries were required to be accessed by the app, and they just didn't seem to be a particularly good reason or justifiable reason to think that that was normal for a VPN application.  

A separate report from Citizen Lab found serious privacy issues with the MY2022 Olympics app, which is required to be used by all attendees at the Beijing games.

For example, it contained an encryption flaw that could expose passport details and medical information of users. 

Both the IOC and Beijing Olympic Committee have rejected claims that there are security concerns with the MY2022 Olympics App. 

Experts told Newsy the only sure-fire way that visitors to the Olympics can protect themselves is by using new devices and accounts only while inside China in order to protect their personal information, then throw the devices away after the games are over.

China is committed to having open and accessible internet available to athletes that are within the "COVID bubble," but there is a line between open internet access and unmonitored internet access — and China is making no guarantees around the latter. 

This story was first reported by Tyler Adkisson at Newsy.