LONDON — NATO has begun a 15-year, $1.12-billion contract with four member nations — Britain, France, Italy and the United States — to provide secure satellite communications capacity over 15 years and has promised a second procurement round for other prospective member-state suppliers including Spain, Germany and Luxembourg.

The second round, whose budget is not yet known, would be opened in two years for a contract that would take effect in 2025.

The unusual procedure was made necessary by the fact that the 29-nation NATO . . .

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