It's probably been done already but even AI knows what's going on is a war crime.
Can one country tell the population of another country to move to a specific location or they will be bombed? And is this legal under international law?
No, one country cannot tell the population of another country to move to a specific location or they will be bombed. This is a serious violation of international law and human rights on several levels:
Threat of Force: The threat of using military force against civilians to coerce them into moving constitutes a violation of the prohibition of the use of force enshrined in Article 2(4) of the United Nations Charter.
Crimes Against Humanity: Such an action could be considered a crime against humanity under the Rome Statute of the International Criminal Court, which defines it as "deportation or forcible transfer of population."
Genocide: If the targeted population belongs to a particular national, ethnical, racial or religious group, and the intent is to destroy all or part of that group, the act could be considered genocide, another crime against humanity under the Rome Statute.
Internal Affairs: Issuing such an ultimatum interferes with the sovereignty and internal affairs of the other country. Countries have the right to control their own populations and territories without external threats.
Human Rights: The action violates the fundamental human rights of the targeted population, including the right to life, security of person, freedom of movement, and the right not to be subjected to cruel, inhuman or degrading treatment.
Consequences: If a country were to carry out such a threat, it would face severe international condemnation, possibly including economic sanctions, diplomatic isolation, and even military intervention. It could also be held accountable before the International Criminal Court.
It is important to remember that international law is not always perfectly upheld, and powerful countries might sometimes act with impunity. However, the principles outlined above represent the established legal framework governing relations between states and the protection of individuals.