Visitors sit in the OAO Rosneft stand in the sponsor's hall at the St. Petersburg International Economic Forum (SPIEF)

The next round of European Union sanctions on Russia will add three major oil groups to the list of Russian companies barred from raising new money in the bloc's capital markets, The Wall Street Journal reports.

The three oil companies-- Gazpromneft, the oil-production and refining subsidiary of OAO Gazprom, oil transportation company Transneft, and oil giant Rosneft -- will be forbidden from raising funds of longer than 30 days' maturity.