I think Putin and his gofors are great practitioners of the "Who are you going to believe: Me or your lyin' eyes?" school of controversy.

Viz their continuing use of the un-uniformed Russian soldiers currently maintaining the Ukrainian 'civil war'.

I'm still waiting for the other shoe to drop from the Netherlands on account of their planeload of dead citizens shot down over Ukraine in the Malaysian Airlines incident.

One thing they can get out of the current poisoning fracas is learning how far along their opponents are at teasing out the technology for detecting and perhaps counter-acting their chemical weapons.