Apparently, Navalny’s biomaterials were flown to Moscow's Nii Sklif lab which didn't find any traces of the poison. But they used an American Agilent Technologies GC-MS [1], while Bundeswehr toxicology lab reportedly used an order of magnitude more sensitive, and more expensive, Bruker's apex-Qe FTMS (no official source for this as "Bundeswehr didn’t disclose the details of their work") which successfully detected novichok.
How did German scientists outplay their Russian counterparts in this case and could it be attributed to simply using a more sensitive equipment with perhaps a better MS method?