Four Russian Su-27 planes approaching NATO planes near Russian borders which were simulating air strikes on Russia. In the past, NATO mostly sent out reconnaissance planes that only observed Russian bases and activities. To practice actually bombing a country — while streaking toward its borders — is highly aggressive. Imagine if Russia did supersonic practice bombings of New York City from 20 miles out! Really, it would only be tit-for-tat and fair if they did.
Totally against the best interests of all parties.
This you can count as evidence of the subtle internal workings of “the snake in the house”.