Much has been said about the Skripal-Poisoning-case, practically nothing has been proven.
Even among the theories, which background might be the basis for the Skripal-case, only those theories have been discussed, which are usefull to at least one big power.
Given the origin of the used substance Novitchok, there indeed is a high probability of Russian involvement.
But !!!!!
Given the timing of the Skripal-case - one week before the Russian presidential elections - there is a high probability that Putin or Putin-loyal forces are not involved in this case.
So who was it ?
As absurd as it might seem, I think there is a high probability that within the Secret Service of the so-called Russian Federation there exists a fraction of Anti-Putin-Activists, who had access to Novichok in possession of Russian Army or Russian Secret Service, and who used this poison only a few days before the Russian Presidential Elections in the attempt to influence the Russian Elections.
The conditions of elections in Russia are not democratically perfect, Putin and his party have privileged access to media, etc.
In this situation many people in Russian institutions (also in the Russian Army and the Russian Secret Service) might tend to deviant behaviour which is rarely known in Western democracies.
And I also think that there is a high probability that within the Russian Government and Putin-loyal forces this theory already has been considered, but this considerations have not been revealed to the public. The UN-Security-Council-Meeting was an opportunity for Russian diplomacy to admit possible defections.
By covering up that they considered the possibility that Anti-Putin-Activists poisoned Skripal and his family, the Russian Government obviously practiced old-fashioned politics, which is not up-to-date in categories like Weltinnenpolitik (World Domestic Policy), or Transparency.
The Russian Government seems to cover something up what various political analysts around the world seem to have considered anyway.
And now for something completely different: International Law, as it is today, seems to have huge problems in dealing with defections within armies and Secret Services.
The normal usage of these defections is the normal blame-game: blaming Putin and Putin-loyal parts of Russia for what Anti-Putin-Activists did.
But there also has to be mentioned that Russia (like Germany or Italy, "die spätgekommenen Nationen" ) are late-developers in categories of Nation-Building and democracy-development.
So the old-fashioned style of Russian politics is not necessarily a consequence of the Putin-Government, but might also have occurred during counter-factually different realistic Russian governments.