It did not name specific companies that would be affected. However, Russian energy giants Rosneft and Gazprom sell oil and gas respectively to China under such agreements.
Shortly after invading Ukraine last February, Russia introduced new rules requiring some export-focused companies to convert their forex revenues into roubles in a bid to curb the currency's decline.
Since then, the rouble has been boosted by demand from
exporters, while there has been limited demand for dollars and
euros from importers due to disrupted supply chains.
(Reporting by Reuters; Editing by Mark Trevelyan)