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National Resistance Center: Wagner convoys head to Russia after fatal crash
(kyivindependent.com)
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Gazprom formed their own group of mercs relatively recently, so that might be what you are thinking of.
While Wagner was the largest and most well known PMC, there have always been several others that don't get much press: https://en.m.wikipedia.org/wiki/List_of_private_military_contractors#Russian_companies