Japan's imposition of export controls on chipmaking tools to align with a U.S. policy restricting China's ability to produce advanced semiconductors is worrying some officials in Tokyo who believe a combative U.S. approach may hamper coordination and needlessly provoke Beijing.

From this week, Japan is restricting 23 types of equipment, ranging from machines that deposit films on silicon wafers to devices that etch out the microscopic circuits of chips that could have military uses.

But while the U.S. referenced China 20 times in its October announcement targeting Chinese companies, Japan has chosen broad equipment controls not specifically aimed at its bigger neighbor.