Hi, alsboy is right. If he doesn't have any alternate employee instead of you, then make a demand. State "If you want me to stay here, then give me this much salary, tell him how much you are going to get in UAE (Tell him a bit more than you will actually get), and then ask him for a good salary. He then has only 2 options.
1- Go according to your demand
2- Fire or let you go, then you'll get the job in UAE.
Hope you get your rights reserved!