"We're very tough but also too scared to threaten you directly, so just be afraid ok?"

Yeah let’s see Russia attack the UK

Pfff... sure. Just make Putin's elites families and relatives, who live in EU and Britain pay for all the damage from these "unknown sources" attacks. Those attacks will end immediately. Just recent known case - oligarch Altushkin supplying Russian ballistic missiles with electronics -but his wife and kids are in London.