China has reportedly commenced restrictions on the exportation of rare earth elements, according to a US newspaper. These elements are vital for numerous industries, including electronics and renewable energy. The report does not specify when these limitations will come into effect or detail the specific areas set to be affected by these measures.

Japan, being a major global player in the car, electronics and renewable energy sectors, heavily relies on the importation of these elements. The possible tightening of the supply by China can significantly impact Japanese companies and the country's economy. There are concerns about how this will affect international relations, the country's economic stability, and the sustainability of key sectors.

In the US or EU, a similar situation would likely trigger debates about supply chain diversification and potential domestic mining of these resources. There might be increased investment in technology to reduce reliance on these elements or initiatives to develop international partnerships with countries that have these resources.