Jiang Jiemin, the chairman of the China National Petroleum Corp., has reportedly floated the idea of building an undersea pipeline that would deliver Russian natural gas to South Korea via China, as an alternative to a long-discussed plan to build a pipeline connecting Russia, North Korea and South Korea. In an email interview, Se Hyun Ahn, chair of the department of international relations at the University of Seoul, discussed the prospect of a Russia-China-South Korea pipeline.

WPR: What are South Korea's sources of natural gas, and how is it delivered? ...