Not all diplomacy, or it wouldn't make sense imho (secret pacts, much boring trading), and even a bit out of character for whoever decides to narrate the chronicles as an infantryman (or similar) of his nation
I think the public diplomacy should be just some nice touches.
BTW, I think I can rightly suppose that the diplomacy is Machiavellian/Vegas, true? Sounds strange to write
"we have put our stealthy armies in the enemy territory, ready to strike the vital targets. Our armies have massed on the borders or in the labs, ready to invade or teleport inside the filthy enemy nation. Our lord the bloodthirsty Prince of Death Krakakazaurum the Eater of Newborn Children gives the command to attack! Chaaaaaaaaaaaaarg... oh wait. We had a NAP-3. Gotta be honourable and wait 3 months." 