Where would you like to work abroad?
Why that particular place?
What opportunities are there?
Have you applied for any jobs? (Stay calm!)
How long for? Has he thought about emigrating?
Basically take all the emotion out of it. Ask questions as you would of a friend. If you feel yourself getting upset, go to the loo, have a drink.
It means his guard is down if he feels that you're not giving him a hard time. And he'll be more honest hopefully.
Then once you've heard enough, let it all out 