A rather sobering article regarding this "exercise". Written by military strategists, it's news the mainstream haven't covered so far.

As I am writing this on Tuesday June 29th - much could have changed by the time this is published. We must not be naïve about this major provocation in the Black Sea. This is sending an obvious threat to Russia. Thus far, Russia has not issued any major statements.

https://sldinfo.com/2021/06/sea-breeze-21-exercising-in-a-challenging-geo-political-context/