US President Donald Trump said that another detainee would be freed on Wednesday, as he met Marc Fogel, who was released after being held in Russia since 2021.

Describing the prisoner deal with Russia as "very fair, very reasonable," Trump said "somebody else is being released tomorrow" without providing details.

Schoolteacher Fogel, freed by Russia after three and a half years in prison, got a flag-waving welcome from Trump after a flight home from Moscow.

"I feel like the luckiest man on earth right now," said Fogel, an American flag draped around his shoulders.

"I'm a middle-class school teacher who’s now in a dream world."

Trump, standing alongside Fogel in the White House Diplomatic Reception Room, said: "To me he looks damned good."

The release of 63-year-old Fogel, who had been detained in Russia since August 2021 and was serving a 14-year sentence, came as Trump seeks to improve relations with Moscow as part of an effort to secure an end to the Ukraine conflict.

Trump and Fogel both thanked Russian President Vladimir Putin for his release.

"We just wanted to get him back home," Trump said, and said he would take Fogel on a tour of the Lincoln Bedroom upstairs in the White House.

Fogel was released into the custody of Trump's Middle East envoy, Steve Witkoff, who made an unannounced stop in Moscow on Tuesday to pick him up.

On a plane home, Fogel, who is from Pennsylvania, was shown with a raised glass, a cheese plate and his US passport in a photo posted on social media by Trump's chief hostage envoy Adam Boehler.

Asked what the United States gave up in exchange for Fogel, Trump told reporters earlier: "Not much" and called the release a show of good faith from the Russians.

"We were treated very nicely by Russia. Actually, I hope that's the beginning of a relationship where we can end that [Ukraine] war and millions of people can stop being killed," Trump said. (Reuters)