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Probably something like half of the military units and other charities accepting donations accept Bitcoin – there's been a lot of problems with companies like PayPal freezing accounts. Also you can buy and sell BTC (and other currencies) AML/KYC free in Ukraine. It's pretty common for things like computer stores to accept stablecoins as payment too.
Ukrainians were the most prolific users of Bitcoin before the war and probably still are so this should resonate well with many there.