So, my reply #2 is possibly too simplistic. And now, I am confused as to which citizenship is secure.
Is this the original country or the new country? The refugee obtains new citizenship or protects the status of the citizenship in the original country.
"to secure" can be used in both cases, and has a slightly different meaning for each case. For the new country, "to secure" includes a meaning of "to acquire" or "to obtain". For the original country, it has a meaning closer to "to protect".
Both meanings imply confidence of possession after the verb action is completed.
The possession is now secure. The method or the way is different, however. One requires an action to obtain and another requires an action to confirm.
One can secure tickets to a concert by buying them, especially when the tickets were difficult to obtain.
One can secure a tent with tent stakes(Zeltzubehöre?) to keep it safe from the wind.