China's restrictions on tungsten exports have led to a global shortage of micro-drills needed to produce printed circuits for artificial intelligence chips, Nikkei Asia writes. Due to a shortage of raw materials, the prices of the intermediate product - ammonium pertungstate - outside China have reached 1.5-1.8 million yuan per ton, which is three times the domestic Chinese quotations. Against the background of the shortage, foreign electronics manufacturers are forced to transfer purchases and part of their production to China.