The Obama administration has offered the Ukrainian government a $50 million aid package to help with economic and political reform, the White House has said.
A statement issued by Vice President Joe Biden's staff also detailed an extra $8 million in non-lethal military aid such as radio equipment and vehicles.
Ukraine's curiously named Internet Party has come up with an offbeat campaign gimmick to lure voters - dressing as Star Wars characters.
Tensions remain high in eastern Ukraine after at least three died in a day of shooting during what was supposed to be an Easter truce.
In an exclusive interview with NBC News, the Ukrainian Prime Minister warns of the dangers of unchecked Russian expansion and aggression.