It is, in essence, the erroneous notion that nations can live in harmony and still be governed by different value systems. It is the idea that we can all live happily ever after in a pluralistic society - giving every man the right to do whatever he wants or believe whatever he wants, as long as he doesn't hurt anyone else. If it is, then you are by definition a humanist. You believe that almighty Man can initiate a second Eden by hammering out summit agreements, peace accords, and arms negotiations - with the help of the United Nations and other international police forces. A similar song was popular among the builders of the Tower of Babel until their work was divinely interrupted.
Morality is a part of the definition.
True peace, therefore, is a state in which there is no conflict of values or morals. It is not just a cease-fire between opposing forces. It is not unilateral disarmament. True peace must require surrender on the part of all opposing parties. Only then will there be an absence of moral conflict.