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In page Foreign relations of Spain:

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Spain has been successful in managing its relations with its three immediate European neighbours, France, Andorra, and Portugal. The accession of Spain and Portugal to the EU in 1986[1] has helped ease some of their periodic trade frictions by putting these into an EU context. Franco-Spanish bilateral cooperation has been enhanced by joint action against recurring violence by separatist Basque group ETA since the 1960s.[citation needed] Ties with the United Kingdom are generally good, although the question of Gibraltar remains a sensitive issue, especially since the UK vote on Brexit.[citation needed]