OAO Lukoil is seeking damages from China Petroleum & Chemical Corp. through arbitration proceedings in London, saying the Chinese company breached an agreement to buy 50 percent of a Kazakh oil producer for about $1.2 billion. Sinopec, as the Chinese producer is known, failed to complete a deal agreed April 15, 2014, to buy the stake in Caspian Investment Resources Ltd., Lukoil said in a regulatory filing. Caspian Investment holds stakes in four hydrocarbon projects in Kazakhstan, Lukoil said. Sinopec didn’t immediately reply to e-mailed requests for comment sent by Bloomberg to its investor-relations department and public-relations staff.