If this brother’s staying in a non-Muslim country will serve some shar’i purpose, such as if he is a daa’iyah who is qualified to call non-Muslims to Islam or if he does a job that is important to the Muslim community, such as if he is an imam, khateeb, teacher, etc, or if he needs medical treatment that is not available in the Muslim world, or he came to engage in permissible trade and then return to the Muslim lands, or he came to acquire knowledge that the Muslims need but is not available in his country, or if he was a refugee fleeing from tribulation, or any other such reason, and he has sufficient knowledge and faith to ward off doubts and desires from himself, then your helping him is an action which is valid according to sharee’ah and you will be rewarded for it. That will come under the heading of helping one another in righteousness and piety and protecting your Muslim brother. 

Otherwise, do not do it. 

You may differ concerning his situation, in which case you should refer to the opinion of those who understand the situation and have knowledge of this brother’s case. May Allaah help us and you to do that which He loves and which pleases Him.