The North American Aerospace Defense Command (NORAD) said on Wednesday that it detected Russian aircraft operating in the Alaskan Air Defense Identification Zone (ADIZ). 

NORAD identified the aircraft as two Tu-95s, which are long-range strategic bombers, and two Su-35s, which are advanced fighter jets.

“The Russian military aircraft remained in international airspace and did not enter American or Canadian sovereign airspace. This Russian activity in the Alaskan ADIZ occurs regularly and is not seen as a threat,” NORAD said in a statement.

NORAD said it responded with an E-3, four F-16s and four KC-135 tankers “to positively identify and intercept in the Alaskan ADIZ.”

Three Russian MiG-31 jets flew together over Estonia on Sept. 19, two NATO sources independently told Fox News Digital. The jets flew back and forth for over 12 minutes before Italian F-35s “pushed them out,” according to the sources. 

“Russia has already violated Estonia’s airspace four times this year, which in itself is unacceptable. But today’s incursion, involving three fighter aircraft entering our airspace, is unprecedentedly brazen,” said Estonian Foreign Minister Margus Tsahkna. “Russia’s increasingly extensive testing of boundaries and growing aggressiveness must be met with a swift increase in political and economic pressure.” 

NATO allies met on Tuesday following the incursion at the request of Estonia, which triggered Article 4. 

NATO Secretary General Mark Rutte said on behalf of member states that Russia’s actions were “escalatory.” 

“We do not want to see a continuation of this dangerous pattern by Russia, intentional or not,” Rutte said. “But we stand ready and willing to continue to defend every inch of ally territory.” 

Fox News Digital’s Morgan Phillips and Caitlin McFall contributed to this report.