No

A cyber attack is a cyber operation, whether offensive or defensive, that is reasonably expected to cause injury or death to persons or damage or destruction to objects.

Michael Schmitt et al; Tallinn Manual 1.0, pp 92
  • Cyber Operation?
  • Expected to cause death or injury to people or objects?
Russian Supply Chain Operations in the United Kingdom does not match this definition. Here's a list of actual cyberattacks and and why this matters.

What happened?

The UK’s National Cyber Security Centre released an advisory note warning that Russian state actors were targeting UK critical infrastructure by infiltrating supply chains