When does love reach a degree that its owner will be gathered with those he loved, and are all types of love included in the Hadith, or is intense attachment a condition, and does loving the people of Japan fall under this Hadith?

It is permissible to love a disbeliever if the love is not due to their religion, but rather due to a kinship, marriage, social interaction, or the benefit they provide. This is evidenced by the permissibility of the Prophet, peace and blessings be upon him, loving his disbelieving uncle, and a man loving his Kitabi (People of the Book) wife. This natural love does not contradict disliking them in religion and disavowing their polytheism. A person may combine disliking something from one perspective and loving it from another, such as disliking fighting due to its hardship while loving it because it is good.