Interested to hear what is involved customs wise when importing shamisen to your country in EU or traveling in/out with it. I would guess the regulations are harmonized even if enforcement has national variation.
I just took a brief look and what I gather would suggest:
-You might need documents to prove the leather and wood does not come from endangered species
-Import and trade of endangered species might be possible under restricted conditions (eg. elephant was born in captivity/killed legally, trees grown on a farm, etc)
-CITES is apparently the central regulation/treaty framework