Earlier quoted context omitted.
That's a very good question. The problem is what's next if they acknowledge that. Say it is acknowledged as an attack on a NATO member, but nothing is done. That immediately turns NATO's worth from whatever its is worth now, to less than the paper it was printed on in 1999 when the Check Republic joined the organization. That's the achilles heel of NATO, and the Russian government knows it. Same goes for Baltic count…
One way to alleviate patch up that achiles heel is a bit shady: proportional indirect responses. (E.g. Wagner forces in north Africa are not officially part of Russian army…)
[1] Macron recently showed some surprising boldness, probably noticing Americans dragging their feet with the aid package and Germans being terribly indecisive as well. Not a bad political play.