Obeying tyrants as a religious duty

[USResident]

@Das_Reich

there is a big contradiction in this statement
in islam if a ruler promotes God i.e enforces shariah then he is NOT a tyrant.

in other words if somehing promotes shariah it CANNOT be tyranny for muslims regardless of what theymay feel about it.

What if the subjects are non-muslims of another soverign state? Can a muslim ruler just go to war with another state to propagate Islam?