A Ukrainian national extradited from Ireland has pleaded guilty to conspiracy charges connected to the Conti ransomware operation, marking another milestone in U.S. efforts to dismantle the prolific cybercrime group.

Oleksii Lytvynenko, 44, admitted to joining the criminal enterprise in 2021 and remained active until his arrest in Ireland in 2023, according to court documents. The plea carries a potential sentence of up to 20 years in federal prison, though actual sentencing will depend on judicial discretion and cooperation.

The Conti gang operated a ransomware-as-a-service model, targeting critical infrastructure, healthcare, and government entities worldwide. By the time of its partial shutdown in 2022, the group had extorted hundreds of millions of dollars from victims, with the FBI and international partners piecing together the network through seized chat logs and cryptocurrency tracing.

Lytvynenko's role within the group reportedly involved facilitating ransomware attacks and laundering proceeds. U.S. authorities have not yet disclosed whether his cooperation formed part of the plea agreement, nor have they named any co-conspirators that might be implicated by his testimony.

No sentencing date has been set. The case underscores ongoing international collaboration against ransomware, though critics note that high-level Conti leaders remain at large, and affiliate groups have simply rebranded under new names.