Japan, the world’s biggest importer of rare earths, plans to buy more of the minerals from Mongolia to reduce dependence on China, according to local newspaper reports.

The country gets 90% of its rare-earth supply from China and wants to reduce its dependency to 70%.

China imposed a de facto ban on mineral exports to Japan in September as relations between the two nations soured over the detention of a Chinese captain whose vessel collided with two Japanese Coast Guard ships in disputed waters, reports Bloomberg.

Japan accounts for 65% of Chinese rare-earth exports, according to estimates.