欧盟在海关事务方面的国际合作

https://taxation-customs.ec.europa.eu/customs-4/international-affairs/union-international-cooperation-customs-matters_en
Union International cooperation in customs matters
Customs matters, insofar as they concern trade in goods across the borders of the Union customs territory, have by nature an international dimension. Those matters cannot however be properly addressed and managed only through unilateral action by the Union. The customs authorities in the Union can accomplish their missions, as defined in Article 3 UCCSearch for available translations of the preceding linkEN•••, only if their action in the Union is supported by cooperation with the customs authorities of third countries. That international cooperation in customs matters is part of the Union customs and trade policy.

And pursuant to Article 5(2)(d) UCC, the EU 'customs legislation' includes 'international agreements containing customs provisions, insofar as they are applicable in the Union。
欧盟在海关事务方面的国际合作
海关事务，就其涉及跨越联盟关税区边界的货物贸易而言，从本质上讲具有国际层面。然而，这些事项不能只通过联盟的单边行动来妥善处理和管理。欧盟的海关当局只有在与第三国的海关当局合作的情况下，才能完成UCC第3条所规定的任务，搜索前面链接的可用翻译。海关事务方面的国际合作是联盟海关和贸易政策的一部分。

根据UCC第5(2)(d)条，欧盟的 "海关立法 "包括 "包含海关条款的国际协议，只要它们适用于联盟"。