A top Chinese diplomat will visit Vietnam this week after China's deployment of a giant oil rig off Vietnam's coast in May increased tensions, AP reported. Chinese State Councilor Yang Jiechi and Vietnamese Deputy Prime Minister Pham Binh Minh will discuss the oil rig when they meet at an annual bilateral event Yang is attending, Foreign Ministry spokesman Le Hai Binh told reporters Monday. Yang's visit will be the highest-level meeting between the two governments since the rig was deployed on May 1.