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Foreign currency losing value — can I report this as a loss for tax purposes?
This loss would be unrealized and, assuming you're a cash-basis tax-payer, you would not be able to take a loss on your 2014 tax return. This is similar to if you held a stock that lost 50% of its value. You wouldn't be able to claim this loss until you finally sold it.  The link that User58220 posted may come into play if you converted your UAH back to USD.