Zapad was commanded by career officer Said-Magomed Kakiyev while Vostok was controlled by the controversial Yamadayev clan (thus earning them the name of Yamadaevtsy, or "Yamadayev men"), which was powerful enough to rival Kadyrov.
Later, Sulim became leader of the GRU Spetsnaz unit called the Special Battalion Vostok ("East") of nearly 600 men, succeeding his brother Dzhabrail Yamadayev following his assassination in 2003.
Four months later, Sulim Yamadayev was assassinated in exile in Dubai—according to the UAE authorities, by Kadyrov's right-hand man Adam Delimkhanov.