I want the traffic to look organic, so I want to have it come from all over the world including from inside the US itself.

The reason to use Russian datacenters for bot army is that they are relatively cheap, and they have Russian IP. It appears like a foreign influence campaign if they are caught as bots. CIA bots probably run through Russia, ffs. There's no connection to Russian government other than allowing bots to an establishment supporter. It's not as though any US/western government has wanted to cooperate with Russia on any matter of concern.