This is nothing new, there was a bunch exchanges already support Ukraine
[LIST.] Exchanges supporting Ukraine let me count: FTX, Binance, Uniswap, Exmo, Currency, Whitebit, Coinsmart, Localbitcoins, Kraken, Bybit, Dmarket and Everstake. Regarding to your question, where are you when the invasion was started? Many people already made donation to Ukraine, not to mention the official Ukraine twitter posting their address. You're too late.