Mikhail Voitenko, editor of Sovfracht, an online maritime publication, told the BBC from Turkey that he fled Russia Wednesday after receiving a threatening phone call from "serious people."
Voitenko suspected that the callers were members of FSB, the Russian intelligence agency.
The journalist said that the callers told him to leave Moscow or face arrest, and that he feared his life could be in danger if he returned to Russia.
In July, the Russian cargo ship Arctic Sea was hijacked by eight men off the coast of West Africa under suspicious circumstances. Following their arrest weeks later by Russian authorities, allegations arose of Israeli intelligence involvement in the operation.
Israeli authorities have denied any involvement in the seizure of the ship.