By Alex Lawler and Maha El Dahan LONDON/DUBAI (Reuters) – The policies of OPEC+ have nothing to do with the surge in crude prices, two sources in the group said on Monday, downplaying the likelihood of any boost to global supply from the alliance that includes Russia and Saudi Arabia. Oil spiked to its highest price since 2008 on Monday amid fears about supply shortages as the United States and European allies considered banning Russian oil, while the prospects of a swift return of Iranian crude to markets receded. [O/R] At its last meeting on March 2, the Organization of the Petroleum Exporti…