If he starts fasting with a country that uses calculations, should he break the fast with them?
Question

                I am a student studying in the state of Karnataka in India. The Muslims here differ concerning the beginning and end of Ramadan. The state here set the beginning of Ramadan at the beginning of the year, which means that they do not rely on moonsighting. This prompted some of the Muslims, most of whom are Arabs, to ignore them and start Ramadan with Saudi. Is this correct? What should the one who fasts with them do now?.
Praise be to Allah.
    If a Muslim is living in a country which relies on proper 
    shar’i sighting of the moon to establish the beginning and end of the month, 
    then he is enjoined to follow them with regard to starting and ending the 
    fast. This has been explained in the answer to question number 12660. But if 
    the Muslim is living in a kaafir country or in a country where they tamper 
    with the beginning and end of the month according to their whims and 
    desires, and do not pay any attention to proper shar’i sighting of the moon, 
    then he should follow the closest country to him where they pay attention to 
    sighting of the moon. If he fasts with a country whose moon sighting is 
    reliable, like the land of the Two Holy Sanctuaries, there is nothing wrong 
    with that. 

    Based on that, if India started to fast one day, for example, 
    after the countries that pay attention to sighting the moon, then it may be 
    said to the one who fasted with them: Do not break the fast with India; 
    rather break the fast with the country which pays attention to moon sighting 
    and make up one day to replace the first day of Ramadan. 

    And Allaah knows best.