> For the record, U.S. politicians have voted on sanctions on Russia

Indeed, the US nearly destroyed Russia's largest aluminum company - Rusal - recently in a sanctions move against an oligarch close to Putin (Oleg Deripaska, who owns the majority of Rusal).

The best way to deal with oppressive regimes, is generally to go through powerful political bodies/groups, whether the UN, G7, or US Congress. The impact a company like Amazon (or Google, Facebook, etc) can make is very trivial. So trivial as to be meaningless to a typical oppressive regime. Congress, in tandem with large allies, can hammer eg Russia's primitive industrial economy, by comparison, with targeted sanctions on steel, aluminum, whatever.