As I explained in my original comment, you can't just create such industries overnight. These require building out supply chains, training workers, and so on. You can just look at how great reshoring chip production is going despite untold billions being poured into that to get an idea of what a monumental task this is.

Building out an industry on this scale is going to take years if not decades. Providing 100 billion to Ukraine in funding isn't going to do jack shit. Ukraine is running out of weapons and ammunition. Replacements for any of these don't exist, and production capacity is insufficient to make any actual difference in the foreseeable future.

Highly recommend reading this article from RUSI explaining these problems https://rusi.org/explore-our-research/publications/commentary/attritional-art-war-lessons-russian-war-ukraine