Nope. The Fediverse is built around this kind of spreading out, it's in the fundamental design of the platform, and a sign it is functioning as intended.

There's probably some third party software by now that you can use to customize your own feed, and bundle them all together if you want. I'm not sure what'd it'd be though. I just use a couple of the communities, personally.

!ukraine@sopuli.xyz is the most popular and frequently updated Ukraine related community that I have found in lemmyspace.

It's a Finnish instance, but all English content.

Edit: I see you have it on your list. Try reading it natively on sopuli.xyz's website. https://sopuli.xyz/c/ukraine

Reading across instances misses a lot of posts and comments.

Even on Reddit, there's /r/Worldnews, /r/noncredibledefense, and many other major Ukrainian discussion subreddits.