Tariffs.
More specifically lack of clarity on implementation details for the collection of duties, lack of infrastructure to process new fees.
22 August 2025 Post Liechtenstein temporarily suspends all parcel services to the US, including deliveries without goods such as documents.
https://post.li/voruebergehende-aus...-in-die-usa/Protocols for general shipment of goods has been delayed, again.
"U.S. Customs and Border Protection announces the extension of the compliance date for new informal entry procedures for international mail from Oct. 22, 2026, to Jan. 20, 2027."
https://www.cbp.gov/newsroom/nation...ntation-dateGeneral shipping of goods from Liechtenstein to USA has not resumed, though somehow the Post found an exception for stamps.