De facto embassy
A de facto embassy is an office or organisation that serves de facto as an embassy in the absence of normal or official diplomatic relations among countries (thus paradiplomacy) usually to represent nations which lack full diplomatic recognition, regions or dependencies of countries, or territories over which sovereignty is disputed. In some cases, diplomatic immunity and extraterritoriality may be granted.
Alternatively, states which have broken off direct bilateral ties will be represented by an "interests section" housed as part of the embassy of a third country recognised by both states. These are often staffed by diplomats from the third country, for example, the Director of the United States Interests Section of the Polish Embassy in Iraq, Krzysztof Bernacki, was a Polish diplomat.
However, subject to the agreement of the host country, an interests section may be staffed by diplomats from the country represented, as in the case of the former United States Interests Section in Havana, which, from 1977 to 2015, was headed by US diplomats, the last of whom, Jeffrey DeLaurentis, became the first chargé d'affaires of the re-established Embassy.