Eroica yori Ai wo Komete

What happens when a gay art thief and a conservative NATO officer cross paths? Disaster, of course. Dorian is an aristocrat, a thief, and a hedonist; Klaus is a duty-driven espionage agent with no patience for fools. Follow them as they chase each other across the globe—from Britain to Baghdad, from Alaska to Alexandria, from Moscow to Madrid. Spectacular locations and non-stop adventures await!

(Source: MU)

Eroica yori Ai wo Komete had fifteen volumes published in English as From Eroica with Love by CMX Manga from November 1, 2004 to March 16, 2010 before the publisher went defunct.