Ukrainian President Poroshenko said that no governor in the country would be allowed to have own army.

President Petro Poroshenko said that no Ukrainian governor would have own "pocket armed forces."

"Territorial defense will be subject to clear military vertical structure; there won't be any governor with pocket armed forces," Poroshenko said.

Earlier Monday it was reported that two battalions of the Ukrainian National Guard had been sent to Dnepropetrovsk by Petro Poroshenko’s decree to "maintain public security."

Relations between Poroshenko and Kolomoiskyi deteriorated last week, when the Dnepropetrovsk governor broke into the headquarters of the country’s oil transportation operations company Ukrtransnafta, outraged with a change in management. The Ukrainian parliament has since demanded Kolomoiskyi's resignation, and Petro Poroshenko reprimanded him on Saturday for "a breach of professional ethics."

Kolomoiskyi reportedly funds a number of Ukrainian volunteer battalions that have committed human rights violations in the southeast of the country, where they have been fighting against independence supporters alongside Kiev forces.

Ihor Kolomoiskyi is one of the richest oligarchs in Ukraine. He has reportedly accumulated an estimated wealth of around $6 billion using questionable tactics in the fields of finance, oil, mass media and metal industries, such as hostile takeovers of his competitors.

He was appointed Dnipropetrovsk Regional Governor after last year's coup in Ukraine by then-acting president Oleksandr Turchynov, who is currently the Ukrainian National Security and Defense Council's secretary.