He started to work as a senior research fellow with the Center for Military and Strategic Research of Russian Defense Ministry , working on the theory and practice of modern guerrilla warfare .
In 1998 , Kvachkov retired from the active military service with the rank of colonel .
Kvachkov started to work as a senior research fellow with the Center for Military and Strategic Research of Russian Defense Ministry , working on the theory and practice of modern guerrilla warfare .
In 1998 , Kvachkov retired from the active military service with the rank of colonel .