Here is a recent article, April 2020, on the latest with US sanctions on Rosneft for trading Venezuelan oil.
https://www.reuters.com/article/us-usa-venezuela-rosneft/u-s-to-lift-sanctions-on-rosneft-units-if-venezuela-involvement-ends-officials-idUSKBN21K2TG
* Washington sanctioned Rosneft Trading in February for acting as an intermediary for Venezuelan state oil company...
* Also sanctions on TNK Trading, another Rosneft subsidiary that traded Venezuelan oil...
* Rosneft said on Saturday it was selling its Venezuela assets, which include several upstream joint ventures with [Venezuelan state oil], to another Russian state-run company.
* sanctions relief if they have no further Venezuela involvement and sell their Venezuela assets.
* Neither Russia nor Rosneft has disclosed the name of the company that will be buying the Venezuela assets from Rosneft.