There was a consistent approach by Russia of denying Ukraine any kind of former-Soviet supplies of ammo around that time and after. There were also incidents in

There was a consistent approach by Russia of denying Ukraine any kind of former-Soviet supplies of ammo around that time and after. There were also incidents in Bulgaria for example. Blowing up an ammo supply in a NATO country is an act of war and could trigger article 5. So I would say they already started acting like they were at war with NATO around that time.