Eric WatkinsOil Diplomacy EditorYemen's oil minister said his country is on the brink of an imminent economic collapse due to recurrent bomb attacks on oil pipelines and ongoing social unrest."Acts of sabotage on the oil pipeline in Wadi Ubaida in Marib province have hampered the flow of oil since mid-March and undermined the confidence of foreign investors in the country," said Amir Salim Al-Aydarus.Yemen is among the Arab countries swept up in protests against longtime rulers since the January revolt that ousted Tunisia's ruler Zine El Abedine Ben Ali.Yemen has likewise been wracked by antigovernment protests and clashes between demonstrators and security forces for many weeks...