A combat air patrol of American and Canadian fighter jets was scrambled this week after multiple Russian warplanes were spotted in the Arctic, the North American Aerospace Defense Command said Thursday, marking the latest military incident to unfold in a region that is drawing increasing scrutiny.

Poland scrambled fighter jets and put its ground-based air defense system on "the highest state of readiness" Saturday morning.

The North American Aerospace Defense Command (NORAD) has claimed that a combat air patrol of American and Canadian fighter jets was scrambled this week after multiple Russian warplanes were spotted in the Arctic.