As President Donald Trump prepares to travel to Alaska on Friday to address the future of Ukraine with Russian President Vladimir Putin, the family of the Texas man serving the longest prison sentence of any American currently being detained in Russia is hopeful that another prisoner exchange between the two nations will be on the agenda.

“We hope for better relations between the U.S. and Russia that will hopefully lead to the release of my brother,” Margaret Aaron, one of David Barnes’ two sisters, told ABC News anchor Gio Benitez in an interview Wednesday.

Barnes, who grew up in Alabama, has been detained in Moscow since January 2022 and is currently serving a 21.5-year sentence.

“He’s hanging in there,” Aaron said. “He has been extremely strong through the last three and a half years. We’re extremely proud of him and he has continued to be hopeful that something will happen.”

Unlike other Americans who have been held in Russia, Barnes is accused by Russian prosecutors of crimes in the United States, not Russia. Yet American law enforcement had no involvement in Barnes’ prosecution in Moscow.

Barnes was convicted by a Russian judge of abusing his two sons years earlier in Texas, but prosecutors in Montgomery County, Texas, told ABC News that law enforcement in the Lone Star State investigated the claims after they were reported by Barnes’ Russian ex-wife and did not find evidence to support them.

“I do know that everyone that heard and investigated the child sexual abuse allegations raised by Mrs. Barnes during the child custody proceedings did not find them to be credible,” Montgomery County District Attorney’s Office Trial Bureau Chief Kelly Blackburn previously told ABC News.

“He’s been suffering,” Aaron said Wednesday. “He’s innocent.”

Barnes’ ex-wife, Svetlana Koptyaeva, has maintained that Barnes abused their sons while the children were growing up in the Texas suburbs years ago. Koptyaeva was charged with felony interference with child custody after allegedly taking the children from Texas to Russia in 2019 while a child custody dispute between her and Barnes was playing out.

In 2020, a Texas family court designated Barnes as the primary guardian of his sons, but since since Koptyaeva had taken them out of the country, Barnes’ family says he decided to travel to Russia after COVID-19 restrictions were lifted to try to fight for similar custody or visitation rights in Moscow’s court system.

Barnes was arrested weeks after arriving in Russia and has been behind bars ever since. In April, a judge in Moscow denied Barnes’ appeal of his conviction.

“We really, really need to have him designated as wrongfully detained,” Aaron said. “Hopefully, to start that process, we need the help of Trump and Secretary [Marco] Rubio.”

The upcoming meeting between Trump and Putin on American soil comes four months after Russian officials released ballerina Ksenia Karelina to the U.S. through a prisoner exchange.

Following Karelina’s return to the U.S., she wrote a letter to Trump calling for the release of Barnes along with fellow Americans Robert Gilman and Andre Khachatoorian. Trump posted the letter on social media.

“David Barnes, a Texas father of two sons, has been detained in Russia for far too long under charges already proven to be false, and it is past time for him to be released,” U.S. Senator John Cornyn of Texas said in a statement at the time. “I urge President Trump and Secretary Rubio to prioritize efforts to bring David and all wrongfully-detained Americans throughout the world home.”

Other Americans who were previously held in Russia, like Paul Whelan, Trevor Reed and Brittney Griner, were transferred to penal colonies far from Moscow following their convictions — but Barnes has been held in Russia’s capital since he was taken into custody.

“We have visited Mr. Barnes eight times since his arrest in January 2022,” a U.S. State Department spokesperson told ABC News. “Our last visit to Mr. Barnes in detention was in May 2025.”

With all eyes on Anchorage ahead of this week’s presidential summit, Barnes’ family and friends in the U.S. will be paying close attention.

“David’s strength keeps us going,” Aaron said.