The Prosecutor-General's Office says the case against Poroshenko, a former head of Ukraine's National Security and Defense Council, was dropped for lack of evidence.
The investigation against Poroshenko started after he was accused of abuse of authority when he was chief of the National Security and Defense Council.
The investigation was initiated by Ukraine's previous prosecutor-general, Svyastoslav Piskun, who was fired last week.
(Interfax-Ukraine/Reuters/AFP)