Japan and the Netherlands are expected to join the U.S. in restricting exports of key microchip technology to China.   The plans involve ending Dutch giant ASML's sales of advanced microchip printing machines to China, curbing the Chinese companies' ability to manufacture some advanced chips. In October, the U.S. announced its own export controls on advanced chip technology to China. The rules — some of the broadest enacted targeting China's chip industry — were intended to limit China's chipmaking abilities and prevent the technologies from ending up in the hands of Beijing's military and surveillance network. Since then, the U.S., Japan, and the Netherlands have discussed more restrictions on semiconductor chip exports to China. The restrictions would target sales of ASML's deep ultraviolet (DUV) lithography machines to China, which claims nearly 20% of the Dutch company's order book. Japan is set to impose similar restrictions on optics and imaging giant Nikon Corp. A deal could be reached as early as today.