Witkoff will now travel east to meet Russian President Vladimir Putin in St Petersburg.
It was positive, nothing unexpected, nothing surprising, and he now comes equipped with ideas to share with the Russian side in St Petersburg, Rubio said during a visit to India.
"We'll see if we can make any progress," he said.
The meeting in Oslo was hastily convened after days of high-level tensions between the US and Ukraine over a controversial diesel deal between the US and Russia, under which Russia will sell diesel to the US.