Tensions are also running high in the East China Sea, where the two countries dispute sovereignty over a number of islands. China is exploring gas fields close to the border as defined by Japan.
在中国东海地区，两国对许多岛屿的主权发生争执，导致两国关系高度紧张。中国正在日本单方面划定的“中间线”附近探索天然气资源。几个月前，一艘中国潜水艇短暂侵入日本海域，引发东京的升级警告。