If you've been interested in contributing a little money to help Ukraine but wondered, "How will doing that help my chess?", all is now clear: you can buy this book. It's a nice survey of Ukrainian chess, past and present, and considering the talent that country has produced, there's going to be some very high-quality material there. I just bought a copy, so I'm putting my money where my mouth is.
While I'm at it, another new book from New in Chess really has me interested, though I'm going to wait a few days to get it through the Forward Chess app: R. B. Ramesh's Improve Your Chess Calculation. It looks really good, but seems mostly aimed at stronger players (I may be in the middle to upper-middle of his intended clientele). If you're an ambitious youngster or anyone 2000 and up, I recommend it. The publisher has provided a generous number of sample pages, so check them out and see for yourself.