She said this at the annual forum organized at the site of the Aspen Institute.
"We need to see the presence of Russian oil on the world market," RIA Novosti quotes Nuland.
According to her, in the event of a shortage of oil, there will be a new rise in prices.
She also said that Western countries believe that the ceiling on oil prices should be such as to limit Russia's profits, but keep it motivated to continue to supply these resources to world markets.
In addition, Nuland said that Iran's implementation of the nuclear deal would allow Iranian oil to return to world markets.