Vidmantas Kučinskas, a Lithuanian businessman who has recently been detained in Slovenia upon Russia's request, is also investigated in Lithuania.
The founder of the Arvi business group is a suspect in a case investigated by Kaunas Regional Prosecutor's Office.
“Since we are speaking about private persons and a pre-trial investigation that is not complete, prosecution service cannot provide more information at this time,” Elena Martinonienė, a spokeswoman for Prosecutor General's Office, told BNS.
She also did not say whether a request would be sent to have Kučinskas extradited to Lithuania.
Kučinskas was detained on July 15 while crossing from Slovenia into Croatia.
It was reported earlier that Russia's Alfa Bank went to court to recover a debt of around 20 million euros from Kučinskas. The bank's lawyer said earlier the businessman is suspected of having intentionally provided wrong information to the bank about the financial situation of Arvi NPK, a fertiliser producer that used to operate in the Russian region of Kaliningrad.
Kučinskas then said Russia's accusations were part of Alfa Bank's intimidation tactics.