DONETSK, Ukraine — Some 300 masked pro-Russian militants wielding baseball bats on Monday attacked a branch of the bank owned by an oligarch regional governor who has voiced criticism of Moscow.

The gang attacked the Donetsk office of the powerful Private banking and metal industry holding belonging to Igor Kolomoisky, a billionaire who is also governor of the nearby region of Dnipropetrovsk.

They shouted slogans accusing Kolomoisky, 51, of being a “fascist” and “enemy of the people,” an AFP reporter on the scene said.

A leader of Ukraine’s Jewish community, Kolomoisky is worth $2.4 billion (€1.7 billion).

Igor Kolomoisky (photo credit: Wikipedia/ Справедливість Повна версія)

Igor Kolomoisky (photo credit: Wikipedia/ Справедливість Повна версія)

Kolomoisky has been particularly vocal in his opposition to Russian President Vladimir Putin, attacking him as “not normal.”

“He has gone mad with his mission to re-establish the Russian empire,” he has said, vowing that “separatism will not pass in Dnipropetrovsk.”

Putin himself responded by calling Kolomoiski “garbage” and a “scoundrel.”

The oligarch has hit the headlines recently in Ukraine by offering a bounty of $10,000 for each separatist held and handed over to the authorities.

The eastern Ukrainian region of Donetsk is in the grip of a separatist movement which the West believes is being backed by the Kremlin.