At the risk of sounding like a weary headmaster whose rogue prodigy has yet again let him down, I'm very disappointed with Russia. I've defended Russia (whilst happily admitting that Putin really is just a ruthless thug) and still believe that Russia is Europe's natural ally in a global alignment of Enlightened North against primitive barbarous South. Personally, I was even prepared to forgive Litvenenko's murder. But this latest affront is an outrage too far.
It's easy to understand why we are the target. The UK is an attractive destination for Russian defectors, ex-spies and refugees from Russomafia thuggery; we have one of the world's best intelligence capabilities, a capable anti-terrorist capacity, a legal system largely free from bribery and corruption and easy access to Europe's best shops. If Russia can make defectors feel insecure in Britain, Putin must think, they will not feel safe anywhere.
Economic sanctions against Russia are merely cosmetic whilst Europe is dependent on Russian gas. Russia's breach is not so grave as to demand military retaliation. Something in between, I think, would suit; perhaps a cyber attack shutting down Russian transport, broadcasting or banking for 72 hours would make the message clear. Something of that sort. Without any direct link to the UK yet clear to Putin from whom the retaliation came.
Let's wait and see.
Wise comments and Tillerson's sacking have led me to believe I've made a right arse of this, and that Russia's guilt is very much more remote than I've assumed above.