The rules, some of which take immediate effect, build on restrictions sent in letters this year to top toolmakers KLA Corp (KLAC.O), Lam Research Corp (LRCX.O) and Applied Materials Inc (AMAT.O), effectively requiring them to halt shipments of equipment to wholly Chinese-owned factories producing advanced logic chips.In a briefing with reporters on Thursday previewing the rules, senior government officials said many of the measures were aimed at preventing foreign firms from selling advanced chips to China or supplying Chinese firms with tools to make their own advanced chips.Eric Sayers, a defense policy expert at the American Enterprise Institute, said the move reflects a new bid by the Biden administration to contain China's advances instead of simply seeking to level the playing field.The Semiconductor Industry Association, which represents chipmakers, said it was studying the regulations and urged the United States to "implement the rules in a targeted way - and in collaboration with international partners - to help level the playing field."Entity listing YMTC would escalate already-rising tensions with Beijing and force its U.S. suppliers to seek difficult-to-obtain licenses from the U.S. government before shipping them even the most low-tech items."