Debt of Honor

Debt of Honor (1994) is a novel by Tom Clancy. It is a continuation of the series featuring his character Jack Ryan. In this installment, Ryan has become the National Security Advisor when the Japanese government (controlled by a group of corporate tycoons known as the Zaibatsu) goes to war with the United States. One of the sub-plots in this novel (on occupying the Siberian "Northern Resource Area") would later form part of the main plot of Clancy's later novel The Bear and the Dragon.