The Imperium of
Inoffensive Centrist Democracy
When remulians want to conquer a planet,they first send a probe to ascertain their technological level, if the dominant species of the planet is in the stone age, they uplift them and then, annex them to the empire. If they are in a more advanced level, (old age, media, etc ..) they descend on their cities and invite their leaders to join them, when all are gathered, the remulians let them know that from that moment, they are under remulian control ,they just have to accept it, to convince them even more,the remulians always destroy a mountain with his arms. usually all accept.
Worth clarifying that the leaders of the planet conquered even stay in power and in case of democratic nations, people can even choose their rulers, the defense forces of the planet are kept intact, but the leaders have to pay tributes to the remulians, obey the overlord that controls the solar system and send their troops to the wars of the remulians, also, every city on the planet is controlled and watched by a remulian flying fortress.