According to the information, the multi-purpose Sikorsky MH-60R Strike Hawk for nine hours - from 19:30 Moscow time on Sunday, September 25, to 04:30 Moscow time on Monday, September 26 - circled over the Baltic Sea about 250 kilometers from the Danish island of Bornholm near which gas leaks were recorded.
The aircraft is known to be equipped for a range of missions, including anti-surface and subsurface warfare, naval artillery support, surveillance and communications relay. It is used for intensive coastal warfare and open water operations.
https://www.flightradar24.com/2022-09-26/00:21/12x/VVHG725/2d9b2666
Yes. But we don't know why this helo was in the air. Just that it was in the area. Could have been observing, could be completely unrelated. I've only put this out there in case someone else with more experience can figure it out.