If he travels during Ramadaan to another country that started the fast at a different time, how should he fast?

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They fasted then they went back to their homeland where Ramadaan had not yet begun
Ramadan began when he was in another country but he did not fast with them because he was travelling. Does he have to make up that fast?

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Every person who is resident in a country is obliged to start and end the fast with its people
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They fasted then they went back to their homeland where Ramadaan had not yet begun
Ramadan began when he was in another country but he did not fast with them because he was travelling. Does he have to make up that fast?

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