In April 1998 , Volodymyr Radchenko wrote a letter of resignation due to personal reasons .
In April 1998 , Volodymyr Radchenko became the first deputy of the Secretary of the National Security and Defense Council , Volodymyr Horbulin .
In April 1998 , Volodymyr Radchenko wrote a letter of resignation due to personal reasons and became the first deputy of the Secretary of the National Security and Defense Council , Volodymyr Horbulin .