The timing of this is odd.
Per the article, this is the "36th survey flight this year made by Russian specialists over the territories of the Open Skies Treaty member states".
So it seems they're conducting a flight roughly every week and a half. But not just in the US but of other treaty member states.
Here's the US Dept of State site on Open Skies, looks like it was updated just this past March. This part seems pretty pertinent: "
Typically, the United States receives 6-8 observation flights from Russia each year, while we conduct 14-16 flights in Russia." So IOW (and assuming DoS is trustworthy in this matter) the US conducts roughly twice as many flights over Russia as the Russians do on us.
Per wiki (who knows what is accurate) Russia has not done a US flyover since 2005 and that was the only one. The program was not implemented until 2002.
I did find somewhere where US observed Russia in early Nov, so maybe they are doing this now as payback.