The accident happened close to the Russian region of Kaliningrad, sandwiched between Poland and Lithuania, at 23:30 Moscow time last night, the Russian Baltic Fleet said in a statement quoted by the Interfax news agency.
"The crew of the Ka-29 helicopter, consisting of two pilots, were killed," the statement said.
A search operation has been launched to recover the bodies.
It was operated by the local Vostok airline.
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