Hmm, you can check out this book.
WAR AND ANTI-WAR : SURVIVAL AT THE DAWN OF THE 21ST CENTURY
Författare: TOFFLER, ALVIN
ISBN: 0751509388
Also, the definition of selfdefense varies, you can chech the UN for information if it is the basis for a State. For civilpersons it varies alot between countries.
Most democrat countries survive with one basis, the state has monopol of violence. Police and army. The interest of state must be higher than idividuals.
What you are looking for I guess is alot of student material for states and the affairs of states. I have only links to Swedish sites. Hopefully someone can help you better. Toffler is a great writer and some points he wrotes may be of use for you.., If not the book is really interesting!
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Be vevvy qwiet..I´m hunting wabbits...
Wolfgirs lair
once-upon-a-paper