Niger has issued Chinese oil companies with a 45-days ultimatum to address alleged breaches of their petroleum agreements, including the repatriation of more than $5.2 billion in crude oil export revenue, as the military-led government escalates pressure on its biggest oil-sector partner. Niger Foreign Minister Bakary Yaou Sangaré announced the deadline on state television on Wednesday, after a recent review of the commitments agreed with China National Petroleum Corporat