Tony was never one to sit still. The Gray Dimension had left him restless, and the moment he heard there was a new villain on Earth, he immediately started itching for action.
As it happened, Russell was also the type who felt uncomfortable if he did not stir up trouble. The two hit it off and began writing a script.
Russell was familiar with this sort of thing, so he proactively took it on with his wealth of experience.
Tony said OK and ordered his private computer butler, Friday, to connect to the global defense system and search for Nick Fury, Peter Parker, and Mysterio.
The global defense system was Tony's masterpiece before his death. Development had begun long ago, with the goal of dressing Earth in an Iron Man Suit.
Well, he was Iron Man, after all.
After the Battle of New York, Tony developed a severe fear of insufficient firepower. He understood all too well that the Avengers alone could hardly protect the entire Earth.
That was indeed the case. The Avengers were an elite tactical squad, more than capable in small-scale conflicts, but they struggled against an alien army.
The so-called global defense system was the drone combat fleet from Spider-Man: Far From Home. Loaded aboard Stark Industries' near-Earth satellites, it could provide emergency support anywhere in the world.
The drones possessed a diverse range of attack methods and could handle all kinds of unfavorable situations.
Their upper limit of firepower might have been lacking, but they were more than enough against weaker opponents—especially compared to Winter Soldier Bucky, who only knew how to spray bullets with a rifle...
Ahem. In short, the drones won through sheer numbers and were the best choice for clearing out cannon fodder on a battlefield.
Having learned from Ultron's example, Tony