It was a quarter of billion years ago and the world nearly came to an end. there was dinosaurs and the greens that they used to eat and today a dino's head is sculptured on a high cliff.
Terrestrial: Mercury, Venus, Earth, Mars
Gas: Jupiter, Saturn, Neptune, Uranus
You would definitely not expect political stability in a state that is being annexed or which does not have a territory - rather the opposite would be true.
Both multinational and souvereign states can have a high lever of political security. However, in a multinational state one can also expect some conflicts between the different ethnic groups - therefore the best answer is "a sovereign state"
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