Russia further extended the prison sentence of U.S. citizen Robert Gilman on Wednesday, following a regional court’s finding that he was guilty of an additional assault on prison staff.

This ruling adds two more years to the former Marine’s current term, bringing his total incarceration period to 10 years.

The latest extension of his sentence occurred in the Voronezh region, where Gilman continues his imprisonment.

Prosecutors had accused him of attacking two prison guards, and the court determined that the incident constituted a new offense warranting extra punishment.

This development aligns with a sequence of steadily mounting charges against Gilman since his initial apprehension in 2022, underscoring how his over consecutive years.

Gilman, from , was first apprehended in January 2022 after train passengers reported his intoxication and disruptive behavior.

Transport police removed him from the train in Voronezh, subsequently detaining him for minor hooliganism.

At that time, Russian media outlets stated that Gilman, en route between Sochi and Moscow to obtain a replacement for a damaged passport, was severely inebriated.

He subsequently asserted in court that .

Gilman was convicted of assaulting a police officer, initially receiving a sentence of three and a half years.

At that point, prosecutors had proposed a four-and-a-half-year term, out of a potential maximum of five.

Digital outlets also reported that with a kick while being forcibly removed from the train.

Gilman’s custodial difficulties then intensified in 2024 when he was found culpable of assaulting a prison inspector during a cell inspection, attacking an investigator, and striking another guard.

These convictions resulted in a sentence of eight years and one month, with Wednesday’s ruling elevating the aggregate to ten years.

Local news sources, among them the business newspaper Kommersant, indicated that Gilman confessed to some of the assaults, according to Reuters.

He stated he initiated violations of prison regulations after being threatened with relocation from his existing detention facility—which he characterized as humane and conducive to receiving parcels from family members—to a maximum-security penal colony. 

On Wednesday, Gilman and clarified his preference to stay in the Voronezh facility.

As per Reuters, Gilman’s legal representative, Irina Brazhnikova, informed the state news agency TASS that he would not contest the latest judgment.

Gilman is one of at least nine American citizens remaining incarcerated following several prominent prisoner exchanges in 2024 and 2025.

Several individuals, similar to Gilman, have , including Michael Travis Leake and Gordon Black.

Gilman’s advocates in the United States contend he was unwell upon his initial detention and was incited into behaviors that led to subsequent charges.