(ANSA) - BELGRADE, MAY 7 - "Some continue to argue that we should reopen the Russian gas and oil tap," but this would be a historical mistake. And we will make sure that it does not happen," said Ursula von der Leyen, president of the European Commission, speaking to the plenary of the EU parliament in Strasbourg following the presentation of the Brussels Roadmap to eliminate Russian energy. Von der Leyen emphasised the need to reduce Moscow's reliance on fossil fuels, which remain "a key source of financing for the Russian war machine," noting that "there is a clear majority of the European Parliament in favour of this initiative" and that "the Polish presidency is also committing to the bottom in this sense." (ANSA).