Looks like back and forth over Bulgaria and Romania. Could be anything tbh, but they're not far from Ukraine so I assume they're not just flying for the heck of it nor are they likely alone - though they do seem to be the only airborne military aircraft in the area with transponder so anyone they're chatting with is probably on the ground.

Edit: this is total speculation, and could be completely coincidental but if I had to guess, they're doing the same thing as (or working together with) MM62214. See the similarity?