According to the lovely trademap.org the biggest part of North Koreas exports are mineral fuels and oils. Okay makes sense. Countries that don't have a lot of those may import them even from North Korea. They're oddly followed by clothing. Especially coats, capes, anoraks... Maybe those are the ones Kim Jong Un grew out of?
I'm not sure about Grenada, but I'd bet you that most of the Windward Islands would've had the UK right on top before it's government agreed to end it's preferential banana market from former West Indian colonies.
I didn't guess that Vietnam imports stuff from Argentina and Ivory Coast. I guessed that Vietnam is a big Asian country that might be a major trading partner for North Korea or India. Thankfully, you don't have to specify who you think they trade with.
once you realize that a lot of the answers are just countries closest to or most related to the exporter, then it's pretty easy to just guess all the caribbean countries and get all the ones for Grenada