In a show of U.S. support for Ukraine's embattled government, Vice President Joe Biden delivered an aid package on April 22 and demanded Russia back off but also warned Kyiv it must tackle the "cancer of corruption". Demanding Moscow "stop talking and start acting" to disarm pro-Russian separatists who Ukraine says aim to undermine the May 25 election, Biden told presidential candidates it may be "the most important election in Ukrainian history".
Reuters: US backs Ukraine, warns Russia with Biden visit
Vice President Joe Biden demands Russia back off.
