Ruling on sponsored students staying in kaafir countries

If
you have knowledge and understanding of the religion of Allaah that
enables you to call others to Allaah and teach the people good things, and
refute specious arguments and practise your religion openly among the
kaafirs around you, then it is OK, because if a person who is as we have
described and who has equipped himself with knowledge stays there, he can
benefit himself and others. Allaah may guide many people through him if he
strives hard in da’wah and is patient, and his intention is sincerely
for Allaah alone. But if a person does not have this religious
understanding or he does not have the patience for da’wah, or he fears
that he may fall into things which Allaah has forbidden, or he cannot
practise his religion openly by calling others to worship Allaah alone and
warning them against shirk and explaining that to the people around
him, then it is not permissible for him to stay among the mushrikeen,
because the Prophet (peace and blessings of Allaah be upon him) said:
“I have nothing to do with any Muslim who settles among the
mushrikeen.” And because of the danger to which he is exposed by
settling among them. And Allaah is the Source of strength.