If your country is not at war, & you are painted by a radar in another country, you do not start a war on your own initiative. If necessary, you die while waiting for an answer to the question you send up the chain of command, asking what to do. Painting you with a radar is not an attack. It is akin to that bloke on the other side of the border pointing his gun at you. You do not shoot him, because that could start a war. You take cover, & report.
Originally Posted by ante_climax
Yes, you can be hung by the balls for starting a war by opening fire without orders. Pleading "self-defence" only works once the other side has actually opened fire. Up to that point, your duty is to report, & await orders. You, a pilot or soldier, are not authorised to take your country to war on your own say-so. Doing so is a crime against your country.
Juris praecepta sunt haec: honeste vivere, alterum non laedere, suum cuique tribuere.