This joint Russian and Chinese flight was the first such occurrence in the Alaska ADIZ and was notable for being the first intercept of Chinese military aircraft near Alaska. Earlier this week, a top DoD Department official noted China's growing military interest in the Arctic region and military cooperation with Russia.

Source:

https://www.msn.com/en-us/news/world/us-wary-of-china-russia-cooperation-in-increasingly-strategic-arctic/ar-BB1qtfEn