Can he break the fast following Saudi when the people of his country are still fasting?
Question

                Here in our country we completed the fast of Ramadaan with thirty days, but in Saudi they fasted for twenty-nine days. I was surprised when one of my friends did not fast on the thirtieth day. He said to me that it is haraam to fast on this day because the moon has appeared in Saudi.

 My question is: what is the ruling on what my friend did?.
Praise be to Allah.
    If a Muslim is in a country that relies on moonsighting to 
    determine the beginning and end of the month, then he is enjoined to start 
    and end the fast when they do. We have stated that in the answer to question 
    no. 12660. 

    But if the Muslim is in a kaafir land, or in a land where 
    they tinker with the beginning and end of the month according to their whims 
    and desires, and do not pay attention to the moonsighting as prescribed in 
    Islam, then there is no sin on him if he follows those whose moonsighting 
    and adherence to Islamic rulings he trusts. See the answer to question no.
    50522, where this is 
    explained further. 

    And Allaah knows best.