Unintentional Killing Of Non Believers
But its a balanced directive giving due regard to political ground realities, as there is no expiation of Diyat even for a Muslim belonging to a Nation in a state of enmity with a Muslim Nation.
As a corollary- since there is no slavery nowadays- would a believer accidentally killed who is in a state which has enmity to the Muslim one just have no expiation? (As a default if there was no treaty)