A vassal state is any state that is subordinate to another. The vassal in these cases is the ruler, rather than the state itself. Being a vassal most commonly implies providing military assistance to the dominant state when requested to do so; it sometimes implies paying tribute, but a state which does so is better described as a tributary state. In simpler terms the vassal state would have to provide military power to the dominant state. Today, more common terms are puppet state, protectorate or associated state.
Read more about Vassal State: Ancient China, People's Republic of China, Ottoman Empire, Troy Under The Hittites
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“It should be noted that when he seizes a state the new ruler ought to determine all the injuries that he will need to inflict. He should inflict them once and for all, and not have to renew them every day.”
—Niccolò Machiavelli (1469–1527)