What if its own source of imports are restricted? It is dependent on Australia, Indonesia, Africa and South America for critical mineral imports. A large segment of its import sources are either politically hostile, or geographically distant or economically, and militarily weak. We known China is unable to protect is trade sources, and supply chain if conflict arises. Therefore I dont think China can use this as trump card. However I agree it has certain leverage until a alternate mineral processing capacity has been built outside China.