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BRUSSELS — Denmark’s foreign minister said Tuesday he is “more optimistic” after technical talks with the United States on Greenland began in Washington, the first senior-level engagement since tensions flared over the Arctic territory. Lars Lokke Rasmussen told reporters on the sidelines of an EU meeting that Danish, Greenlandic and U.S. officials held “the very first meeting at senior official level in Washington yesterday regarding the Greenlandic issue.” “It went well in a very constructive atmosphere and tone, and new…