(NewsNation) — An American who has been detained in a Russian prison for three years is "fighting for his life," and his sister hopes peace talks between President Donald Trump and Russian President Vladimir Putin will lead to his release.

David Barnes has been detained in Moscow since January 2022, following allegations from his Russian ex-wife, Svetlana Koptyaeva, that he sexually abused their children while living in the United States.

Koptyaeva took their two young children to Russia amid a custody battle. The Texas Justice Department has found those allegations to be not credible, and there is an arrest warrant out for Koptyaeva after taking the kids to Russia from Texas.

Barnes visited Russia to see his children and was subsequently arrested and detained by Russian authorities. He

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