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I haven't heard any recent information. Russians are likely still around. The Chinese may not have arrived at all. And America has accused Cuba of stationing troops, which is plausible and has precedents.
Wheter they'll act is an open question. Russians can act as a deterrent protecting Maduro's installations, but they're likely unwilling to commit to real fighting -Russia has sank resources into maintaining the status quo, but knows it has no power projection to sustain an intervention. Cubans, on the other hand, are much closer and ideologically motivated, and could thus be willing to shoot at Venezuelans.