If Russia gets away with using chemical weapons in Britain, what will it try next?

By now, it really should not come as much of a surprise that yet another Russian has been attacked in Britain. Opponents of Russian President Vladimir Putin have been showing up dead in and around London for more than a decade. In some cases, the trail clearly leads back to Moscow, as with the use of such gruesome chemical agents as polonium (Alexander Litvinenko in 2006) or, in the most recent incident, a nerve agent (Sergei Skripal and his daughter, who both survived the poisoning but remain in serious condition). In other cases, the evidence is subtler (e.g., Boris Berezovsky, found dead under suspicious circumstances in 2013).