Ukrainian President Petro Poroshenko on Saturday pledged to stop oligarchs from sowing "chaos" after the governor of a key industrial region quit following a row over a state oil firm.
Billionaire Igor Kolomoisky reluctantly offered to step down this week as governor of the key industrial region of Dnipropetrovsk after a dispute over control of the country's largest oil producer ended up with armed men storming the offices of two state-controlled oil firms.
"As long as I am president, I will not allow conflict at the heart of power," Poroshenko told the private ICTV channel.
"My main priority is the fight against oligarchs," he said. "I will not allow chaos, neither in Kiev, nor in other cities."
He funded a powerful volunteer militia group that has played a leading role in fighting the heavily-armed pro-Russian insurgents in the east.
The president -- himself a billionaire -- is under pressure from the International Monetary Fund (IMF), which approved a $17.5 billion rescue package for Ukraine's war-battered economy earlier this month, to clean up the country's politics.
Kolomoisky's Privat Group owns 43 percent of Ukrnafta.
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