Absolutely, they do. There are several international conventions. I could get the citations for you if you like.
Just to give you one small example, international law indicates that once a refugee is determined to be a refugee, you should make every possible effort to integrate them into your society, so as not to leave them displaced and hanging in limbo for a long time.
Historically, Canada has been one of the very few countries that has been really good at that. We allow them to get permanent residence. We allow them to proceed toward citizenship. This would be a huge step backwards.