The B-1s were joined by Gripen fighters from NATO allies Hungary and Sweden during their flyover of Latvia, which lies to the west of Russia.
An estimated 9,000 soldiers will participate across more than five states.
Thousands of allied American and Filipino forces have opened annual combat drills that will include simulating the defense of the Philippines.
Canada and Finland are jockeying for position in what could become a large U.S. investment in icebreakers.
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