Four Russian spy planes fly past Alaska — it's the third time this month Russian military aircraft have done so

Four Russian spy planes fly past Alaska — it's the third time this month Russian military aircraft have done so

• Russian military aircraft have been flying past Alaska on the regular this month.

• Four Russian maritime reconnaissance aircraft flew past the northern part of the state Friday, North American Aerospace Defence Command announced.

• The incident marks the third time this month Russian military aircraft have flown past Alaska. In two previous incidents, F-22s were dispatched to intercept Russian fighters and bombers.

• Friday's flights come just one day after Russian bombers approached the British coastline, leading the UK and France to scramble fighters in response.

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Russian military aircraft - everything from long-range bombers to advanced fighters to spy planes - have ventured close to Alaska three times this month, twice prompting US F-22 stealth fighters to intercept the aircraft.

Two pairs of unidentified Russian maritime reconnaissance aircraft flew past northern Alaska Friday, the North American Aerospace Defence Command (NORAD) announced in a statement, noting that while the surveillance aircraft entered the Alaskan Air Defence Identification Zone, they remained in international airspace.

The flight follows an alarming incident Thursday in which two unresponsive Russian Tu-160 bombers approached the British coastline, causing France and the UK to scramble fighters to intercept the supersonic aircraft.

"Russian bombers probing UK airspace is another reminder of the very serious military challenge that Russia poses us today," Defence Secretary Gavin Williamson said in a statement, adding, "We will not hesitate to continually defend our skies from acts of aggression."

Japan encountered similar problems on Wednesday, when it sent fighters to intercept Russian fighter jets approaching Japanese airspace. The same thing happened earlier this month.

Two Russian Tu-95 Bear bombers accompanied by Su-35 Flanker fighter jets approached western Alaska on Sept. 11, leading the US to dispatch two F-22s in response.

A similar incident occurred on September 1, when two of the same type of bomber entered the Alaskan Air Defence Identification Zone south of the Aleutian Islands. Alaska-based NORAD F-22 fighters were sent out to deal with that situation as well.

Following the first incident earlier this month, American defence officials speculated that the Russian bombers may have been practicing for possible cruise missile strikes on US missile defence systems in Alaska, although the true purpose of the flights is difficult to discern.

While seemingly disconcerting, Russia does this sort of thing fairly regularly. Russian Tu-160 bombers flew past Alaska in August, and another pair of bombers did the same in May. These flights come at a time in which tensions between Moscow and Washington are on the rise.