Russian ‘Bear’ bombers and surveillance aircraft continue to fly near the Alaskan coast, making it four nights in a row that the Kremlin has sent military planes within miles of the United States border, reports Fox News.

On Wednesday, two Russian spy planes were spotted off the Aleutian Islands in the Bearing Sea, circling inside a US defensive zone for hours before returning to base. 

Thursday evening, a pair of nuclear-capable bombers flew near Alaska and Canada, again intruding into US defensive airspace. In both instances, the US declined to scramble fighter jets to intercept the Russian aircraft, instead monitoring them from the ground.

The Russian military has now conducted flyovers near the US border for four consecutive days. 

The Kremlin pushed back, claiming Russia "regularly carries out patrol missions above the neutral waters of the Arctic, the Atlantic, the Black Sea and the Pacific Ocean."

The recent moves come as relations between Moscow and Washington are at an ‘all time low’ over US military intervention in Syria and alleged Russian ‘meddling’ in the 2016 US election.