The North American Aerospace Defense Command (NORAD) has detected and tracked four Russian military aircraft operating in the Alaska Air Defense Identification Zone (ADIZ) on Tuesday, according to a statement.
"The Russian aircraft remained in international airspace and did not enter American or Canadian sovereign airspace. This Russian activity in the Alaska ADIZ occurs regularly and is not seen as a threat," the statement said.
The ADIZ is a zone that stretches out 150 miles from the U.S. coastline where the U.S. requires aircraft to identify themselves.
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