Former boxing world champion and mayor of Ukraine's capital, Vitali Klitschko, speaks outside the parliament building in Kiev last year. Getty images
Klitschko has said his countrymen and women will fight for their future, if Russia invades. . EPA
A huge screen shows an election campaign advertisement for Klitschko before local elections last year. Getty Images
Then opposition leader Klitschko arrives to address anti-government demonstrators at Independence Square in Kiev, 2014. Getty Images
Klitschko celebrates after winning his WBC Heavyweight World Championship fight against Dereck Chisora of Great Britain in Munich, Germany, in 2012. Getty Images
Wladimir Klitschko, left, and his brother Vitali pose with their championship belts in 2012. Getty Images
Shannon Briggs of the USA exchanges punches with Klitschko during the WBC Heavyweight World Championship fight in Hamburg, Germany, in 2010. Getty Images
Klitschko during a training session in Austria, in 2010. Getty Images
