PART I—PRELIMINARY
International Crimes
8. A person who is alleged to have committed an offence under section 6 may be tried and punished in Kenya for that offence if—
(b) at the time the offence is alleged to have been committed—
(ii) the person was a citizen of a state that was engaged in an armed conflict against Kenya, or was employed in a civilian or military capacity by such a state;
Unique provision - jurisdiction
EDIT.