As far as I understand: NATO is drafted as a defensive (not offensive) alliance. So if Russia attacks a member state, other member states are obliged to go to w

As far as I understand: NATO is drafted as a defensive (not offensive) alliance. So if Russia attacks a member state, other member states are obliged to go to war. If a member state attacks Russian troops (at least arguably an offensive move) and that escalates into a war between that member state and Russia, than NATO member states would have a very good excuse not to come to that members aid (as it would not technically be a treaty violation).