Adiz

They said the planes were discovered in action in the Alaska Air Defense Identification Zone (ADIZ).
NORAD added that the Russian planes remained in international airspace and did not enter American or Canadian sovereign space, reports Reuters.

China has made the second largest incursion into Taiwan's air defence zone this year with Taipei reporting 30 jets entering the area, including more than 20 fighters.

Taiwan's defence ministry said late Monday it had scrambled its own aircraft and deployed air defence missile systems to monitor the latest Chinese activity.

Taiwan accused Beijing of bullying and damaging regional peace on Oct. 2 after Chinese fighter jets and bombers made their largest ever incursion into the island's air defence zone.

Beijing marked its National Day on Friday with its biggest aerial show of force against Taiwan to date, buzzing the self-ruled democratic island with 38 warplanes, including nuclear-capable H-6 bombers.