Dietary biology of the Eurasian eagle-owl
In rare cases, other predators may kill a Eurasian eagle-owl. In Europe, there is one case of a white-tailed eagle killing an eagle-owl and there are at least four known incidents of eagle-owls being killed by golden eagles. Also, an eagle-owl was found among the prey remains at a golden eagle eyrie in Mongolia. An eagle-owl was also found amongst the prey in the nest of steppe eagles ("Aquila nipalensis") in Altai Krai, Russia. In 2016, a large female subadult Bonelli's eagle ("Aquila fasciata") apparently preyed upon a three-year-old male Eurasian eagle-owl in Spain. Pine martens ("Martes martes") and stone martens ("Martes foina") are opportunistic nest predators. Although martens could probably reach most eagle-owl nests due to their agility and climbing abilities, they probably will attack nests when disturbance or low food supply result in lower nest attendance by the parent owls. Cases where nests have atypically been accessible on foot (for both humans and wild predators) have resulted in Eurasian eagle-owl nests being predated. Eurasian badgers, wild boars and raccoon dogs and raccoons, the latter two both where non-native in Germany, have also reportedly preyed on nests that they can access. In coastal areas of Spain, red foxes were reported to have preyed on four eagle-owls, including one unsexed brooding adult, at nests found to be reachable on foot by researchers. Cases of red foxes killing Eurasian eagle-owls at nests have reported elsewhere albeit very rarely, normally the eagle-owl is a greater danger to the foxes (and many of its other nest predators) than vice versa. In May 2017, a red fox was filmed killing two chicks and raiding the larder of an eagle-owl in Denmark.
Hunting in Russia
Russia's northeast part, the Kamchatka Peninsula and the coastal regions of the Pacific Ocean, have the highest density of brown bears. There are Eurasian brown bear ("Ursus arctos arctos"), Siberian brown bear ("Ursus arctos beringianus"), Syrian brown bear ("Ursus arctos syriacus"), Ussuri brown bear ("Ursus arctos lasiotus"), etc. 
Grand Prince of Moscow Ivan IV Vasilyevich was present at the bear hunts at the age of 13. False Dmitriy I was especially keen on bear hunting. A legend describes the miraculous salvation of Tsar Alexis of Russia from a bear by Saint Sava. After 1650/51 the bear hunts of Tsars became rare. In 2007 Russia proposed to allow polar bear hunting by the Chukchi people, for the first time since the Soviet Union banned hunting the dwindling species in 1956.