Returning home from a journey while not fasting, then having sexual intercourse during the daytime in Ramadan

Q: A man traveled to Makkah Al-Mukarramah and returned home in the Eastern Region while he had broken his fast. Then, he had sexual intercourse with his wife in the daytime of Ramadan, taking into account that he was unaware of the ruling. His wife asked him fearing that (Part No. 9; Page No. 231) there is something wrong in that but he said: "In sha’a-Allah (if Allah wills), there is nothing wrong in that." However, he is doubtful about the matter and wants to know the ruling: What should be done if it was forbidden, and what would be the Kaffarah (expiation)?

A: Each of you has to offer Kaffarah, which is to emancipate a believing slave. If this is not possible, each of you has to fast two successive months. If this is also not possible, then each of you has to feed sixty poor persons. Moreover, you have to make up for the day in which you had sexual intercourse in addition to feeding one more needy person if making up for that day was delayed until another Ramadan came.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.