We divorced due to simple personality differences; my ex-wife is a foreigner, and what should I do if she takes the child to her home country after the divorce?

Since she is American, she told the court that she wants to go live with her family back home...
Even though the husband opposed it and made a huge scene...
The court allowed the child to go to the US
And ordered me to pay 2 million KRW in monthly child support
They even made such irresponsible remarks like, "Just go visit them in the US during school breaks later"
What happens if my wife takes the child to the US?
I am 100% certain that eventually, the child won't be able to do video calls, claiming they are too busy or too sleepy...