A more thorough explanation:

An antimanifesto is a statement made by a country at war, in which they claim that their actions are purely defensive. This is often used as a way to justify their involvement in the conflict.

During World War II, Germany issued an antimanifesto in which they claimed that they were only fighting defensively against the aggression of other countries. However, this was widely seen as a false justification for their aggressive actions.

Another example of an antimanifesto is the statement made by the United States during the Vietnam War, in which they claimed that they were fighting to defend democracy and prevent the spread of communism. However, many people saw this as a thinly veiled attempt to expand American influence in the region.

These examples illustrate how an antimanifesto can be used to justify a country's involvement in a war, even if their actions are seen as aggressive or unjustified by others.