Japan, South Korea, and China are increasing the pace of stockpiling on natural gas ahead of the winter with inventory levels above the five-year average as the biggest energy importers in North Asia look to avoid buying LNG on the spot market during the winter. LNG inventories at city gas providers in Japan are well above seasonal norms based on the most recent data from those providers cited by Reuters. Japan and South Korea have also called for energy conservation to avoid shortages this winter, while gas demand in China is set for its first…