Based on Dustin and Dart's relationship, it's possible if the demogorgons are trained from an early age and are well fed, and because we know that the Red Army has one demogorgon, they can breed more. A good comparison would be the raptors from Jurassic World.

However the problem is that the demogorgon species is still very much an instinctive predator, and if the Mind Flayer flays them, well we know what happens then. Seeing as how the Red Army unintentionally unleashed The Mind Flayer before, it would follow suit for them do something equally naive, as to breed an army of demogorons, that might escape or be used against them by the Mind Flayer.

There is only one good reason I can think of to introduce a demogoron at Kamchatka, because they are a checkov's gun for season 4, meaning that we will see them unleashed at some point in the season. It would make sense to have that take place in the final couple of episodes, which could amount to Hopper surviving Kamchatka, which is overrun with flayed or disobedient demogorons.

The Russian Demogoron/Demogorgons were undoubtedly tortured so they would be more subservient, but if they had the chance to get vengeance, they would easily take it. Maybe Hopper's escape plan involves freeing some of the demogorgons, or maybe the demogorgons free themselves, ei. Rise of the Planet of the Apes. What do you think, is this way too similar to what happened in season 2, or would this make for an interesting story in season 4?