Forestry authorities on Sakhalin island last week said 83 bears had to be shot dead because they were hostile, a figure that has nearly tripled from last year.
"This has never happened before," a local forestry worker told AFP, asking not to be named because he is not authorised to speak to the press.
"There are not enough fish, berries, nuts," he said, adding that overfishing of local salmon was partly to blame.
Bears who come out to villages in search of food eat dogs and one recently bit a man's hand.
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"At this time of year bears should be balls of fat, but these animals have almost no fat at all," the employee said.
A hunter and a fishermen died from bear attacks in September, regional forest ministry official Sergei Prokopenko told local media.
Animals have also attacked cattle and one family found a bear digging out and eating potatoes on their garden plot in late September, local media said.
He expected the crisis to continue until November, when malnourished bears usually freeze to death while others go into hibernation.
Sakhalin is a large forest-covered island off the east coast of Russia that lies north of Japan between the Okhotsk Sea and the Sea of Japan.
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