Washington and Havana broke diplomatic relations decades ago at the height of Cold War tensions. Since 1977 they have maintained "interests sections" rather than embassies in each other's capitals, with both facilities formally under the legal protection of Switzerland.
Cuba also operates a Permanent Mission to the United Nations in New York.
Cuba said that until further notice, consular services such as passport and visa processing will be cut at both of its outposts in the U.S. except in "humanitarian" and other unspecified cases.
Havana argued that under international conventions, the U.S. State Department is legally bound to provide the conditions for diplomatic missions to function.
"The Cuban Interests Section particularly regrets the effects this may have on Cuban and U.S. citizens," the statement said, warning of a "negative impact on family visits, academic, cultural, educational, scientific, sports and other kind of exchange."
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