On Wednesday, a Russian regional court extended the prison term for American citizen Robert Gilman after convicting him of a fresh assault on prison personnel.

This latest decision tacks on an additional two years to the former Marine’s sentence, raising it to a total of 10 years, according to a Reuters report.

Gilman is currently incarcerated in the Voronezh region, where the court delivered this recent verdict.

Prosecutors alleged he attacked two guards, and the court determined this incident merited further sentencing.

With this ruling, Robert Gilman now faces a decade behind bars after the Voronezh court added two years due to the alleged assault on the guards. (REUTERS/Vladimir Lavrov)

Since his initial arrest in 2022, Gilman has seen a pattern of escalating charges, reflecting how his prison term has continued to grow over the years.

Gilman, from Dracut, Massachusetts, was first arrested in January 2022 after passengers on a train reported he was drunk and causing a disturbance.

The former Marine’s Russian prison sentence keeps growing after a new assault conviction. (REUTERS/Vladimir Lavrov)

Transport police took him off the train in Voronezh, where he was detained for petty hooliganism. 

At the time, Russian media reported that Gilman, who had been traveling between Sochi and Moscow to replace a damaged passport, was heavily intoxicated.

He later claimed in court that he believed his drink had been spiked.

Gilman was convicted in 2022 of assaulting a police officer, initially receiving a sentence of three and a half years. 

At the time, prosecutors recommended four and a half years, of a possible five.

Gilman’s legal troubles escalated since his 2022 arrest for a train disturbance while he was traveling to replace his passport. (REUTERS/Vladimir Lavrov)

Fox News Digital also reported that Gilman bruised a Russian police officer with a kick while being dragged off of the train.

Gilman’s troubles in custody then increased in 2024 when he was found guilty of attacking a prison inspector during a cell check, assaulting an investigator and beating another guard.

Those convictions brought a sentence of eight years and one month, with Wednesday’s decision pushing the total to a decade.

The former U.S. Marine got two more years in a Russian prison for assault. (Vladimir Lavrov/REUTERS)

Local media, including the business newspaper Kommersant, reported that Gilman admitted to some of the assaults, per Reuters.

He said he began breaking prison rules after he was threatened with transfer from his current detention facility, which he described as humane and where he could receive packages from relatives, to a maximum-security penal colony. 

On Wednesday, Gilman apologized in court and explained he preferred to remain in the Voronezh facility.

According to Reuters, Gilman’s lawyer, Irina Brazhnikova, told the state-run TASS news agency that he would not appeal the newest verdict.

Gilman is among at least nine Americans still imprisoned in Russia following multiple high-profile prisoner exchanges in 2024 and 2025. 

Former prisoners released by Russia, journalist Evan Gershkovich, right, former U.S. Marine Paul Whelan, center, and U.S.-Russian journalist Alsu Kurmasheva, left, smile after landing at Joint Base San Antonio-Kelly Field, Texas, on August 2, 2024.  (Suzanne Cordeiro/AFP via Getty Images)

Several, like Gilman, have U.S. military backgrounds, including Michael Travis Leake and Gordon Black.

Supporters of Gilman in the United States argue he was ill when first detained and was provoked into actions that produced additional charges.