FinanceOil up as Russia gas flow to Europe falls, EU Russian oil ban loomsCrude rallies after nearly 10% slide over two daysNot budging: Hungary digs heels in over EU embargo on Russian oil, shown are Hungary's Prime Minister Viktor Orban and European Commission President Ursula von der LeyenPhoto: HUNGARIAN PM'S PRESS OFFICE/VIVI//REUTERS/SCANPIXReutersJennifer PresleyHouston