The Amur cubs were specially trained to cope after being raised in Zhelundinsky Nature Reserve.
Skin and skull of rare animal was hidden in the suspect's car.
Amur leopards now number more than 100 for first time in decades, say experts.
North Korea urged to join Russia and China in fixing reliable numbers for Amur big cats.
The number of Amur leopards in the wild in the Far East of Russia has dramatically increased, say wildlife experts.
A few years ago only 30 were living in the wild, but now there is a realistic chance to avoid extinction.
Hidden video footage helps scientists learn more about female Amur leopards.
Endangered Amur tigers are protected under President Vladimir Putin's special project.