Does a husband still have to pay an alimony if the ex-wife moves out of the UAE?

Dear sir/madam,

My ex-wife will relocate to another country and take our child with her. The agreement we signed in Dubai is obligating me to pay alimony.

Do I still have to pay if she moves out of the UAE? The cost of living is very different in her new place.

Can the Dubai agreement be enforced outside the UAE?

Also in the UAE, the child becomes an adult at the age of 21, but in the new country, it is 18. Which one will apply?

Thanks!