That works when everyone is being honest about the country of origin. That doesn't help if Russia makes the product, slaps "made in Turkey" on it, and then ships it to Turkey to get it to the US.

That's the reason why customs reserves looong periods for reviews. They are currently prosecuting a couple of companies and people for that kind fraud that concerned solar module imports into the EU between 2015 and 2016. Customs are sticky with that. Black imports like drugs are, IMHO easier to hide than falsely declared goods as the latter leaves a paper trail.