That's a good point. It opens up a possibility for Russia's opponents to use any of these substances to assassinate someone with everyone believing it was the R

That's a good point. It opens up a possibility for Russia's opponents to use any of these substances to assassinate someone with everyone believing it was the Russians. The Russians would deny it but nobody would believe them. Then obviously if that plan would leak, there is a risk of the previous attempts to now be pinned on this other party.