Husband's desire to have the family live in home country while the wife refuses

One of my friends is married. Both are Muslims and based in Dubai. They married in Pakistan back in 2010. They have 2 daughters; 8 and 9 years.

She's a housewife under the husband's visa. The wife is given a hard time for the last few years and she knows the laws that her husband must provide house rent and kids maintenance so she's doing blackmail and not willing to go back to Pakistan even.

Recently, the husband caught her and knew that she was out with one Pakistani guy and kids were alone in the house. The husband is happy to cover the kids' maintenance.

1. In such a situation, what's the best way if the husband wants the family to live in Pakistan and the wife keeps refusing?

2. How to secure himself?