Russia has been in Venezuela for a long time.
Beat me to it. They've already deployed to protect their rebuilding of the Venezuelan oil industry. Which didn't go well.
They don’t have military bases there, nor do they have deployed nukes either, so what’s your point? The Chinese own the port facilities on either side of the Panama Canal, are you going to tell me those violate the Monroe Doctrine? They don’t because they’re not military bases.