Isarapong played a key role in the coup against the government of then Gen Chatichai Choonhavan when he was deputy Army commander-in-chief.
He became the secretary general of the National Peacekeeping Council (NPKC) or the coup maker.
Isarapong became the interior minister in the post-coup government of Anand Panyarachun.
He later succeeded Gen Suchinda Kraprayoon as the Army chief when Suchinda became the prime minister.