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.
The internal violence in Chechnya peaked on July 16, 1998, when fighting broke out between Maskhadov's National Guard force led by Sulim Yamadayev (who joined pro-Moscow forces in the second war) and militants in the town of Gudermes; over 50 people were reported killed and the state of emergency was declared in Chechnya.
Four months later, Sulim Yamadayev was assassinated in exile in Dubai—according to the UAE authorities, by Kadyrov's right-hand man Adam Delimkhanov.