That's kind of a weird line to include in an allegedly "straight news" article, since tons of other experts also seem to point to the sanctions as a big factor.
Example, [here].(https://globalaffairs.org/commentary-and-analysis/blogs/lifting-sanctions-could-reduce-pressure-us-border)
If they just say "experts," it gives the impression that there is a broad consensus in the field, which I'm not sure is the case here (cmv, I guess). If they just included that line after talking to like two people, that feels like a downgrade in quality from what I'd expect from AP.