Vitali Klitschko says war with Russia would be a "disastrous scenario", warning a press conference in Donetsk that Ukraine's army is not in a "good state".
ITV News' Emma Murphy reports:
Klitschko - For many years Gov tried to run down the Ukrainian army. They are not in good state. They do not have the equipment>
Klitschko: We didn't expect this from Russia but we cannot solve it with the weapon. Bloody war is a disastrous scenario.
Klitschko says he worries that Russian troops will advance but asked how they can stop it/what they would do has no answer, stares at table.
Barack Obama warned Russia that the West will be forced to apply a cost to Moscow if it fails to change course in its dispute with Ukraine.
The ballot paper that the people of Crimea will use in Sunday's referendum was published today
Vitali Klitschko's visit to the eastern city of Donetsk is clearly an attempt to try to ease the divisions with Ukraine.