This is stated on the official website of the NBU, Censor.NET reports.
According to the regulator, the official exchange rate of hryvnia to foreign currencies set by the National Bank of Ukraine as of Feb 26, 2015 is as follows:
UAH/USD 30.01 UAH;
UAH/RUB - 4.79.
Yesterday, the National Bank strengthened the official hryvnia rate by 24 kopecks - up to 28.04 UAH/USD.