It's worth noting Russia has a tendency to lie about chemical attacks in Syria just to set mood music, rather than pre-empt specific incidents https://www.bellingcat.com/news/mena/2018/12/18/chemical-weapons-and-absurdity-the-disinformation-campaign-against-the-white-helmets/
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https://en.wikipedia.org/wiki/Accusation_in_a_mirror