Arms merchants, captive scientists
The Dragon of Heaven was created by the Mandarin, using outsourced scientists, to take over Russia. It was believed that the Dragon would invade all of Russia giving it a strong ruler, the Mandarin. The entire machine was so in tune that it repelled the Avengers and Winter Guard, along with toying with Iron Man. The dragon not only repelled the defenders below but seemed almost invincible. The dragon finally fell not from the heroes below but because it’s power source was destroyed.