Former heavyweight boxing champion Vitali Klitschko has pulled out of the presidential race, giving his backing to Petro Poroshenko - a businessman and former foreign minister.

Meanwhile, Yulia Tymoshenko, former prime minister, set out to fight for the top job on her own, pledging to take Crimea back from Russia.

Al Jazeera's Nick Spicer reports from Kiev.

Source: Al Jazeera