It's more like, some guys here wrote - why if Russia poisoned him, they used this poison, because Russians will be a first suspect? As you can see, Russia denies everything and says that they never had this poison.Not that I suggest being uncritical of Western media, but do you really think that Russian media is likely to provide accurate reporting on this subject?
And Russian government media fails to provide good coverage on even non-political topic. For example, situation from years ago - there were TV show in which competed team from different countries. Not sure, but I think Kazakhstan won it. Russian TV channel owned by government on which TV show was broadcasted showed Russian team getting their medals or cup and celebration and said that Russian team won and Kazakhstan was second.