If the crescent of Ramadan is sighted in a country, is it obligatory for the people of the neighboring country to fast?

Question:
Our brother asks another question, saying: Is it permissible for the people of one country to fast Ramadan based on news from another country, given that they do not see the crescent until the second day relative to their neighboring country? Please guide us on this issue. May Allah reward you with good.

Answer:
The Prophet (peace and blessings be upon him) said: . Thus, the Prophet (peace and blessings be upon him) made fasting obligatory by one of two things: either by sighting the crescent, or by completing the count of Sha'ban to thirty days. For the sighting, one Muslim is sufficient if one Muslim sees it. And if this is established with the judge, then fasting is obligatory based on his sighting. This is evidenced by the fact that a Bedouin came to the Prophet (peace and blessings be upon him) and informed him that he had seen the crescent. The Prophet (peace and blessings be upon him) asked: "Do you testify that there is no god but Allah and that Muhammad is the Messenger of Allah?" He said: "Yes." So the Prophet (peace and blessings be upon him) ordered the people to fast. Similarly, Ibn 'Umar informed that he had seen the crescent, so he informed the Prophet (peace and blessings be upon him) of this, and the Prophet (peace and blessings be upon him) fasted and ordered the people to fast. Good.
So if the competent legal authority establishes the existence of the crescent, establishing the sighting of the crescent by one person or more, then it is obligatory for all Muslims to fast in the country and in the rest of the region where the horizons do not differ. Good. The close region. Yes.
The close countries that are in one region where the horizons do not differ are all required to fast. But if the horizons differ, there is disagreement among the scholars, and the correct view is that each people of a region follows their own sighting. This is based on the saying of the Prophet (peace and blessings be upon him): "Fast when you see it and break your fast when you see it." And because Ibn 'Abbas (may Allah be pleased with him) in Madinah did not fast based on the sighting of the people of Sham, which indicates that the difference in horizons affects the beginning and end of fasting, and that each people follows their own sighting. However, if the horizons do not differ for the area or the close region, then it is obligatory for everyone who is informed of the sighting of the crescent by a legal sighting to fast.