More study of changing conditions in the Arctic, a region where Russia and other nations are increasing their military presence, is needed to support U.S. national defense, according to a new federal report.

The U.S. Arctic Research Commission, an independent federal agency that advises the White House and Congress, made the recommendation in a brief report released last month.

“The Arctic region is critical to the defense of our homeland, the protection of U.S. national sovereignty, and the fulfillment of our nation’s defense commitments. Research is critical to ensuring that the United States sustains strategic and tactical advantages over our competitors and adversaries as Arctic conditions evolve,” the commission said.

The commission said its report is intended to help guide the nex

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