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"I can tell that yesterday I had a meeting with Chairman of Mykolaiv Regional State Administration Vadym Merikov and, despite certain achievements, work related to ATO [the Anti-Terrorist Operation in eastern Ukraine], other things, after the conversation with me, he submitted a letter of resignation from the post of head of the regional state administration. This is political responsibility," Poroshenko told journalists after opening the Bunge Ukraine production and transshipment complex at the Mykolaiv seaport.

Read alsoHigh profile corruption suspect flees from hospital – journalistAs UNIAN reported earlier, the Security Service of Ukraine (SBU) together with military prosecutors June 3 detained a group of officials, led by the first deputy chairman of Mykolaiv Regional State Administration Mykola Romanchuk on charges of bribery.

A network of tunnels was revealed in the basement of Romanchuk's house, with safes where a significant amount of cash in U.S. dollars, jewelry, and antiques were stored.

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Merikov was appointed Chairman of Mykolaiv Regional State Administration on July 28, 2014.