(Portland, OR) -- A Russian cryptocurrency money launderer who was extradited from the Netherlands has pleaded guilty in a Portland federal court. Federal prosecutors say 30-year-old Denis Dubnikov ran the operation from 2018 through 2021 with a group of other people. They used Ryuk ransomware attacks on businesses in the U.S. and abroad to generate Bitcoin. They moved the cryptocurrency through a series of transactions. Dubnikov was arrested in Amsterdam in 2021 and extradited to the U.S. His sentencing will happen in April, and he could up to 20 years in prison and a 500-thousand dollar fine.