Zelenskyy dismisses Khomchak from NSDC secretariat, appoints Deputy Chief of General Staff Ostrianskyi in his place Ukrainian President Volodymyr Zelenskyy has made personnel changes in the National Security and Defense Council. Major General Yevhen Ostrianskyi, who previously served as deputy chief of the General Staff of the Armed Forces of Ukraine, has been appointed as the new first deputy secretary. 2 789 7 Previously in trend: Staff changes members of NSDC