it depends on how 'industrial capacity' is defined. in the sense of who can mobilise the most powerful industrial output and rapidly scale production in a crisis, it's definitely the u.s. by far as it has abundant oil, natural gas, coal, and raw materials e.g. rare earth processing capability etc, it's a world leader in defense and aerospace manufacturing, it's highly developed logistics and capacity to repurpose industries and so on. china's advantage is that it has a huge labour pool, which is of decent skill level, though lacks high end manufacturing ability. china also has decent domestic coal reserves and metals, but the big problem is that it depends on imports for oil. russia is just a joke next to either of them. russia has limited and ageing population, and worst of all their skill is very low and their education system shat the bed after the fall of the soviet union - this is the issue with energy in russia is that a lot of it was maintained and operated by westerners who worked in russia. also these boomers who still have some skills are ageing out, and they never possessed high end ability in the first place. germany is relevant as it has the highest skill workforce in the world, and it's pretty big too, though it's concentrated amongst the boomers u.s. also has a larger steel production capacity installed than japan, it just isn't using it. in less than a year it could probably double that.
United Kingdom