Clearly, however, it's going to require a substantial foreign investment from somewhere to get Venezuela on the road to recovery. What that will require is a new regime with credibility enough to attract not just Chinese and Russian money, but money from investors all over the world, including non-oil companies the Chavez/Maduro machine have already ripped off; this will require confidence that they aren't going to get ripped off again. Anything short of that won't do, and there are roads to build and electrical grids to rebuild and hydroelectric generators to repair, none of which the Russians and Chinese are going to bring to the table.
Moreover, pre-empting existing creditors within the oil market may have long-lasting effects on China's and Russia's participation in it. For example, China at the table with, say, BP, negotiating a trade deal and BP says yeah, by the way, we're going to need a little premium on top of that price to replace our assets that you have - take it or leave it. And the other oil companies all say the same thing. It isn't an embargo, but it is business.
https://oilprice.com/Energy/Crude-Oil/Venezuelas-Oil-Meltdown-Defies-Belief.html
You’re right about foreign investors. I’m thinking France’s Total. They are one of the few oil majors that have the scale and resources to turn things around, and so far they’ve stuck it out.