What pockets of reddit do you suspect of being heavily Russia-influenced?
My experience of reddit is that it is wildly anti-Russian since the invasion, sometimes to an almost cartoonish degree (e.g. r/worldnews).
Probably the explicitly anti west left and the racist, fascist, and trad right. The groups you’d want to push to destabilize the West.
I think Russia did, successfully for quite some time, attempt to direct anger towards the countries supporting Ukraine. Russia would drop a bomb on Ukraine and 90% of the comment section would hate the West for it. The goal was to fuel defeatism and infighting. The latter they encouraged from the start. Reading Reddit, you would have thought Germany had attacked Ukraine from the western flank. In the days and weeks before every major pending Ukraine decision in the US, you could see a noticeable uptick of Russian-friendly talking points. Before the US election, a suspicious amount of Redditors claimed that Trump would give Ukraine more weapons than Biden. These days, they are encouraging the Europe is weak rhetoric. If a toy drone gets spotted somewhere, the only acceptable response is nuking Moscow and EU should disband if they don't dare - that inane take to me is also trolling.