Where are the red-lines against grey-zone attacks?

Drones buzzing airbases and HMS Queen Elizabeth. Undersea cables cut.  Mysterious parcel fires at air-freight depots.  These have all been described as hybrid, grey-zone, or sub-threshold attacks against the UK and it’s allies.

But if they are all below the threshold of an act of war, where does that threshold lie?

Sitrep explores the use of deniable attacks, from disruption and disinformation to assassination and bomb plots. How do we defend against them, deter enemies from even trying, and stand up to international bullying?

Kate Gerbeau and Professor Michael Clarke talk to grey-zone expert Elisabeth Braw, former military intelligence officer Colonel Philip Ingram, and Tan Dhesi MP who chairs the Commons Defence Committee.