Russia has asked Kazakhstan to prepare to supply 100,000 tonnes of gasoline.
It is said to be because of shortages exacerbated by Ukrainian drone attacks, three industry sources told Reuters.
One of those sources said a deal had been agreed.
Neither the Russian nor Kazakhstani energy ministries replied to requests for comment.
Drone attacks reportedly stopped 14% of Russian primary oil refining capacity by the end of March.
Belarus has already agreed to help Russia with gasoline supply, Reuters said.
The authorities have said the domestic situation is stable and stockpiles are sufficient.
Russia is normally a net exporter of fuel.
