MacKay spoke after a meeting with U.S. General Gene Renuart, commander of the binational North American Aerospace Defense Command (NORAD).
"They (the Russians) have been professional in the way they have conducted their aircraft operations," Renuart said.
Canada's minority Conservative government has promised to spend billions of dollars boosting Canada's presence in the Arctic, which scientists believe has vast reserves of oil and natural gas.
"Our intention is very much to demonstrate our sovereignty, our capability to protect our territory, our airspace, our water (and) our people in the Arctic and that includes our resources," MacKay said.
Five countries with an Arctic coastline -- Russia, the United States, Canada, Norway, and Denmark through its control of Greenland -- have competing claims to the region.
Scientists say oil and gas exploration could begin during the summer months within decades.
Russia said this week it would respond to any moves to militarize the Arctic.
Ottawa -- which plans to build a deep water port in the region -- has stepped up sovereignty patrols in the Arctic and last August it said it would toughen reporting requirements for ships entering its waters in the Far North.
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