The US Department of Finance imposed sanctions against another subsidiary of Rosneft, registered in Switzerland, TNK Trading International SA. According to the agency, Rosneft transferred Rosneft to it for the sale of Venezuelan oil Rosneft Trading SA, which fell under sanctions in February.

Igor Sechin. Photo from the official website "Rosneft"
“After on February 18, 2020, the Ministry of Finance imposed sanctions against Rosneft Trading SA (RTSA), the cargoes of Venezuelan oil, which was engaged in RTSA, were transferred to TNK to avoid US sanctions,” the agency said.
In mid-February, the US authorities imposed sanctions against Rosneft Rosneft Trading and Vice President of the Russian state-owned company Didier Kasimiro-in connection with the continuation of their work with Venezuela. The US Treasury believes that the structure of Rosneft provided “material assistance” to the country and the regime of Nicholas Maduro. The order of sanctions was given by President Donald Trump. We talked about this here .
The transition period in order for the companies to close all cases with TNK, will be valid until May 20, 2020.
"As a result of today's solution, all assets and shares in TNK assets, which are either in the USA or belong to US citizens, or belong to 50% or more (both directly and through intermediaries) to citizens or companies that are already under sanctions, must be blocked and OFAC (the management of foreign asset controls. - The Bell)" In the report of the US Treasury.