He came home from travelling and was not fasting, and he had intercourse with his wife during the day in Ramadan; do they have to offer expiation?
Question

                What is the ruling on a man who was not fasting during the month of Ramadan on the basis of a fatwa from the Dar al-Ifta’ in his country and with the excuse of engaging in Jihad for the sake of his homeland. When he returned from the front after being away for several days, he came back early during the day in Ramadan, and naturally he was not fasting because he had been at the front. He had intercourse with his wife during the day in Ramadan when she was fasting. What is the ruling on him and on his wife, if she participated willingly or did not? May Allah reward you with good on our behalf.
Praise be to Allah.
      If a traveller comes home not fasting, or a sick person 
      recovers, or a menstruating woman becomes pure during the day in Ramadan, 
      they do not have to refrain from eating and drinking, etc., according to 
      the opinion of the majority of fuqaha’. See the answer to question no.
      49008

    But the one who is not fasting in such cases does not have 
    the right to have intercourse with his wife who is fasting and was not 
    travelling. If he does that and is aware of and remembers the ruling, then 
    he is sinning by helping her and calling her to commit an act of 
    disobedience. 

    The case of the wife is subject to further discussion: 

    -If at the time of intercourse 
    she was excused because she was forced or forgot, or was unaware of the 
    prohibition on intercourse during the day in Ramadan, then her fast is still 
    valid, and she does not have to make it up or offer expiation according to 
    the correct view.

    -If she participated willingly, 
    and was aware of and remembered the ruling, then she has sinned and 
    invalidated her fast, and she has to offer expiation, according to the 
    majority of the fuqaha’, because it is proven in as-Saheehayn that 
    the Prophet (blessings and peace of Allah be upon him) instructed the man 
    who had intercourse with his wife during the day in Ramadan to offer 
    expiation. The basic principle is that rulings apply equally to both men and 
    women, except in cases where the wise Lawgiver has clearly made an 
    exception. Because she has transgressed against the Ramadan fast by having 
    intercourse, then she must offer expiation like the man. The punishment has 
    to do with intercourse, so it applies equally to both the man and the woman, 
    as in the case of the hadd punishment for zina (fornication or adultery).

    See also the answer to question no.
    106532

    And Allah knows best.