|The Senkaku/Diaoyu Islands dispute|
is a continuing source of tension
between Japan and China.
Comment: China enacted a similar rare earth embargo on Japan in 2010, causing the price of some rare metals to more than triple. Two years later but still with few alternate sources for the heavy rare earth metals, Japan again faces potential shortages. Alkane Resources' Dubbo Project does contain heavy rare earths, but since Japanese companies will be required to process the metals in Japan it will almost certainly take a few years to develop before it significantly affects global prices.