John Raine, an ex-UK diplomat now @ IISS, adds this commentary; it is sub-titled:
Much has been made of hybrid or 'grey zone' conflict between states in recent years. However, as John Raine argues, the ever widening list of actions viewed as belligerent only increases the likelihood of escalation.
Link:https://www.iiss.org/blogs/analysis/...the-grey-zone?