Can Jumu’ah prayer be held in Dar al-Harb?
Question

                If we say that some country is dar al-harb (abode of war) or dar kufr (abode of disbelief), do we have to pray Jumu’ah there? In other words, do we have to gather for Friday (Jumu’ah) prayer in dar al-harb or dar kufr?
Praise be to Allah.
    Allaah has enjoined Jumu’ah upon the Muslims who are settled 
    in a city or village, and He has forbidden them to become distracted from 
    that by buying and selling, etc, because of the general meaning of the verse 
    (interpretation of the meaning): 

    “O you who believe (Muslims)! When the call is proclaimed 
    for the Salaah (prayer) on Friday (Jumu‘ah prayer), come to the remembrance 
    of Allaah [Jumu‘ah religious talk (Khutbah) and Salaah (prayer)] and leave 
    off business (and every other thing). That is better for you if you did but 
    know!”

    [al-Jumu’ah 62:9]
And it was narrated in 
    the hadeeth of ‘Abd-Allaah ibn ‘Umar and Abu Hurayrah (may Allaah be pleased 
    with them) that they heard the Messenger of Allaah  (peace and blessings 
    of Allaah be upon him) say from the minbar: “There are people who should 
    stop neglecting Jumu’ah, or else Allaah will put a seal on their hearts, 
    then they will surely be among the negligent.” (Muslim 2/591). And the ummah 
    is agreed on the fact that Jumu’ah is obligatory. There is no sound evidence 
    in sharee’ah to indicate that the obligation of praying Jumu’ah applies only 
    in dar al-Islam and not in dar al-harb, so the Muslims who are settled in 
    dar al-kufr are obliged to perform Jumu’ah prayer if the conditions are met, 
    following the general meaning of the texts of the Qur’aan and Sunnah which 
    indicate that it is an individual obligation (fard ‘ayn) on the 
    Muslims, if the conditions stipulated by sharee’ah are met.