Alexander Anatolyevich Solovyev is Russian and an instructor in the art of Systema (Russian Martial Art). He is masterful in the way he approaches the various issues of combat. What drew me to him and to study his approach via his videos is that he approaches combat in a simplified manner. His web address is https://vk.com/sistem_spb or http://www.solovevstyle.ab.ru/.  Enjoy!