Wall Street Journal reporter Evan Gershkovich will remain jailed on espionage charges until at least late June, after a Moscow court on Tuesday rejected his appeal that sought to end his pretrial detention.The 32-year-old U.S. citizen was detained in late March 2023 while on a reporting trip and has spent over a year behind bars. Last month, his arrest was extended until June 30 in a ruling he and his defense lawyers later appealed. The appeal was heard by a Moscow appellate court on Tuesday and rejected.His arrest in the city of Yekaterinburg rattled journalists in Russia, where authorities have not detailed what, if any, evidence they have to support the espionage charges.Gershkovich and his employer have denied the allegations, and the U.S. government has declared him to be wrongfully detained.Analysts have pointed out that Moscow may be using jailed Americans as bargaining chips in soaring U.S.-Russian tensions over the Kremlin’s military operation in Ukraine. At least two U.S. citizens arrested in Russia in recent years — including WNBA star Brittney Griner — have been exchanged for Russians jailed in the U.S.Video below: White House says in March it's working to get Evan Gershkovich home from RussiaGershkovich 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.Daniloff was released without charge 20 days later in a swap for an employee of the Soviet Union’s U.N. mission who was arrested by the FBI, also on spying charges.