Japan's Sapporo district court sentenced two Russian citizens to 12 and 11.6 years in prison for smuggling 30 kg of drugs into the country, the RIA Novosti news agency reported Thursday.
Sergei Titov, 26, and Roman Andrushenko, 31, were also ordered to pay $41,000 in fines.
The Russian citizens were arrested in January on Hokkaido Island, along with a Japanese national, RIA Novosti reported at the time.
They travelled to Japan on a Cambodian cargo ship in December 2014, smuggling 26.7 kilograms of psychotropic substances to the country.
Titov and Andrushenko planned to sell the drugs, valued at nearly $15 million on the black market, Japanese police said.